DESC:FIELD OF THE INVENTION

The present invention relates to compositions for developing latent impression marks and processes for preparing the same.

BACKGROUND OF THE INVENTION
[002] Fingerprints are one of the most important pieces of evidence at the scene of crime as they can lead to the identification of an individual beyond reasonable doubt. Various methods have been used by the investigating agencies around the world for identification of fingerprints to trace or identify the suspected criminals as well as the victims of crime. Each individual has a unique fingerprint. This is due to the fact that the skin especially on the palm region of the hands and feet forms ridges, called as the papillary ridges. These ridges are unique to each individual, which do not change over time and are easy to classify.
[003] However, fingerprints deposited on surfaces are seldom visible to the naked eye. They are also easily hampered with and damaged due to physical contact with various elements such as water, soil, snow and other environmental factors. As disclosed In Latent Print Development by Brian Yamashita & Mike French, Fingerprints comprise glandular secretions including amino acids, urea, fatty acids, glycerides, inorganic salts, and the like. These components are not ordinarily visible. The amount of glandular content deposited on a surface may vary considerably, amounting to a possibility of weak and incomplete prints. There have been many inventions dedicated to detecting fingerprints based on a particular surface or a particular glandular secretion. These methods and formulations are either too complex to use on crime scenes or too conventional to be applicable on multiple surfaces and weak prints, the common practice thus is to use separate methods and equipments for different surfaces at different locations which could be very impractical. A multipurpose composition applicable on all types of surfaces and easy to use is thus highly required for detection of latent impression marks.
[004] Fingerprints which are not visible to the naked eye are detected using physical, chemical or electrical processors depending upon the surface on which the fingerprints have been deposited. Developing agents such as powders or chemical reagents are used to develop a high degree of visual contrast between the ridge patterns and the surface on which a fingerprint has been deposited.
[005] Several techniques are available for fingerprint detection. Methods involving the use of ninhydrin, diazafluorenone, vacuum metal deposition for detection of fingerprints have been reported. These reagents are surface-specific and have limited applications. Ninhydrin is suited only for paper, whereas vacuum metal deposition is suited only for polymeric articles.
[006] Most often Police personnel responsible for the evidence collection at crime scenes are from a non-scientific background and therefore find it difficult to choose the right composition for a particular article at the crime scene. Most commonly on a crime scene, surfaces bearing fingerprints are wetted intentionally or accidentally, this amounts to the dissolution and dispersion of the contents of the sweat compositions which form the fingerprint, this damages the print leaving very little sweat/glandular content to be detectable. A need for discovering such damaged and wetted prints is essential while still maintaining a non-surface-specific character of the composition used for developing the print.
[007] One of the common methods used in fingerprinting include using Ninhydrin as disclosed in US 2715571 which relates to a process of treating paper and like material to develop latent fingerprints. The invention uses Ninhydrin as the indicator to detect the amino acids and proteins. The composition can only be used on paper like surfacesand cannot be used on wet surfaces as Ninhydrin has high solubility in water, whichresults in faint prints.
[008] US 1,259,981 relates to the standard black fingerprint powder described as a combination of lamp black and gum adhesive. It further discloses the use of the powder for taking prints by employing the technique of spraying the print after dusting with an alcohol solvent to dissolve the gum. This method requires a high degree of skill in using it. Further, it cannot be used on a dark surface as the black powder will not give a contrast for effective visualization of the prints.
US 6,841,188 relates to a method of developing latent fingerprints involving the preparation of an 8-quinolinol complex. This method is restricted to usage on only porous surfaces.
US 3,132,036 discloses developing a latent fingerprint on a surface by applying to the surface a layer of opaque magnetizable powder and passing a magnet across the layer of powder. This method is again not applicable on all surfaces such as wet surfaces or surfaces under soil.
[009] US 6,841,188 discloses a technique used in fingerprinting by using a physical developer. The physical developer technique involves the reduction of a silver salt. This method has several shortcomings. First, the silver salt is costly, toxic, readily reduced by organic contaminants, and is typically unstable when exposed to light. Second, the method also involves several steps and typically requires lengthy development time to visualize the latent prints. Third, the documents must generally be pretreated with an acid solution in order to reduce darkening of the paper background containing the latent prints. Fourth, the redox chemicals are hazardous. Fifth, the process typically requires the use of purified, distilled water. Sixth, the processing equipment must be kept scrupulously clean to prevent reduction of the silver salt. Seventh, the working solution is unstable and is generally usable only for several hours up to a few days if properly stored away from light. Eighth, the processed documents continue to darken over time when exposed to air and light which drowns out the visualized prints unless they are treated with bleach. Ninth, the visualized prints, because they are grey, cannot be readily seen on black, dark, or deeply colored papers. Tenth, the spent chemicals are considered hazardous waste.
[010] At present, the commercial fingerprint detecting compositions are surface-specific thus restricting the applicability of such formulations.
[011] Most of the compositions for detection of imprints are imported in the country. These compositions are costly and their usage protocol is complicated, many times making their use unsuitable. Moreover, they are surface specific, that is different formulations are required for articles having different textures, which makes it costly.
[012] Also, different formulations are required for different crime scenes. It is found that a formulation which can be used at one crime scene cannot be used at a different crime scene thus limiting the applicability of the formulation.
[013] Therefore, there is a need for a composition, which can detect the impression marks on all types of surfaces and on different crime scenes.

SUMMARY OF THE INVENTION
[014] An aspect of the present invention provides a composition for developing latent impression marks comprising at least one dye; at least one inorganic compound having crystal unit cell volume from 250 A or more; and at least one adhesive agent.
[015] In another aspect of the invention, a process for preparing a composition for developing latent impression marks comprises the steps of suspending an inorganic compound having crystal unit cell volume from 250 A or more in water to obtain a mixture. A dye and an adhesive agent is added to the mixture to obtain a solution, which is dried to obtain a powder.
[016] In yet another aspect a process of developing latent impression marks on an article comprises the step of applying the composition on a surface of the article having an impression mark and illuminating the surface with a radiation.

[017] BRIEF DESCRIPTION OF THE DRAWINGS
Fig.1 shows the fingerprint developed using conventional composition.
Fig.2 shows the fingerprint developed using the composition of the present invention.
Fig.3 shows fluorescence exhibited by known compositions to develop fingerprints.
Fig.4 shows, fluorescence exhibited by the composition of the present invention to develop fingerprints.

DETAILED DESCRIPTION OF THE INVENTION
[018] Unless otherwise indicated, this disclosure uses the following definitions.
[019] “Impression marks” refers to imprints such as fingerprints, palm prints, sole prints and the like.
[020] “Latent” refers to unclear or invisible impression marks.
[021] “Article” refers to an object having an impression marks.
[022] According to various embodiments of the present invention that are described below a composition for developing existing latent impression marks on an article is provided, wherein the composition comprises of at least one dye, at least one inorganic compound having crystal unit cell volume from 250 A or more and at least one adhesive agent.
[023] In one of the embodiments of the present invention, the dye is preferably fluorescein, whereas the inorganic compound used in the composition is a carbonate salt, preferably zinc carbonate, wherein the crystal unit cell volume of Zinc Carbonate is 281.68 A. Further, the adhesive agent constituting the composition is a polymer, preferably rosin.
[024] In one embodiment of the present invention, the dye is selected from brilliant blue and acridine orange.
[025] The dye selected from fluorescein, brilliant blue and acridine orange is preferably in the range of 1-2% of the composition.
[026] In one embodiment of the present invention, the inorganic compound is an oxide selected from the group comprising titanium dioxide and molybdenum oxide.
[027] The inorganic compound selected from zinc carbonate, titanium dioxide and molybdenum oxide is preferably in the range of 95-97%. The crystal unit cell volume is from 250 A or more.
[028] In further embodiments of the present invention, the adhesive agent used to form the composition is talc.
[029] The adhesive agent selected from rosin and talc is preferably in the range of 1-2 %.
[030] In further embodiment of the invention, a combination of dyes selected from fluorescein, brilliant blue and acridine orange can be used.
[031] In an embodiment of the invention, a combination of inorganic compounds selected from zinc carbonate, titanium dioxide and molybdenum oxide can be used.
[032] In other embodiment, a combination of adhesive agents selected from talc and rosin can be used.
[033] In one embodiment of the present invention the composition is in a powder form.
[034] One aspect of the present invention discloses a process for preparing a powder composition for developing existing latent impression marks on an article. The process comprises of suspending an inorganic compound having crystal unit cell volume from 250 A or more, in water to obtain a mixture. A dye and an adhesive agent is added to obtain a suspension. The suspension is dried to obtain a powder, which is grounded to form the final composition.
[035] The dye used in the process for making the composition is selected from fluorescein, brilliant blue,acridine orange or a combination thereof. The dye is preferably in the range of 1-2% of the composition.
[036] The inorganic compound used in the process for making the composition is selected from the group comprising zinc carbonate, titanium dioxide,molybdenum oxide or a combination thereof. Preferably, the amount of the inorganic compound is in the range of 95-97%. The crystal unit cell volume is from 250 A or more, the crystal unit cell volume of zinc carbonate is 281.68 A and for Molybdenum Oxide is 280 A.
[037] The adhesive agent used in the process of forming the composition is selected from rosin,talc or a combination thereof. Preferably, the amount of the adhesive agent is in the range of 1-2%.
[038] In an embodiment of the present invention the ratio between the edges a and c of the unit crystal cell of the inorganic compound is from 1:3.23 or more. The ratio between edges, a and c of the unit crystal of zinc carbonate is 1: 3.23 , the ratio between edges, a and c of the unit crystal of titanium dioxide is 1: 1.55 and the ratio between edges, a and c of the unit crystal of molybdenum oxide is 1:1.60.

[039] The powder composition as described in the aforesaid embodiments are used in a method for developing existing latent impression marks on an article. The method comprises of applying a powder composition comprising of at least one dye, at least an inorganic compound and an adhesive agent on an article and illuminating the article with radiation having wavelength in the range of 500-550 nm to obtain clear and sharp impression marks.
[040] Another embodiment of the present invention provides a composition for developing existing latent impression marks on wet or dry article, wherein the composition comprises at least one dye, at least one inorganic compound, having crystal unit cell volume from 250 A or more, at least one adhesive agent and a detergent.
[041] The dye used in the process for making the composition is selected from fluorescein, brilliant blue, acridine orange or a combination thereof. The dye is preferably in the range of 1-2% of the composition.
[042] The inorganic compound used in the process for making the composition is selected from the group comprising zinc carbonate, titanium dioxide, molybdenum oxide or a combination thereof. Preferably, the amount of the inorganic compound is in the range of 95-97%.The crystal unit cell volume is from 250 A or more, the crystal unit cell volume of zinc carbonate is 281.68 A and for molybdenum oxide is 280 A.
[043] The adhesive agent used in the process of forming the composition is selected from rosin, talc or a combination thereof. Preferably, the amount of the adhesive agent is in the range of 1-2%.
[044] The adhesive agent selected from rosin and talc is preferably in the range of 1-2%.
[045] In one embodiment of the present invention, the detergent is preferably sodium dodecylbenzenesulfonate.
[046] In an embodiment of the present invention the composition is in a suspension form.
[047] Another aspect of the present invention provides a process for preparing a spray composition in suspension form for developing existing latent impression marks on an article. The process comprises suspending an inorganic compound having crystal unit cell volume from 250 A or more in water to obtain a mixture. A dye and an adhesive agent is added to the mixture to obtain a solution. The solution is dried to obtain a powder, which is grounded. The grounded powder is suspended in water to obtain a suspension to which a detergent is added to obtain the final liquid composition.
[048] The dye used in the process for making the composition is selected from the group comprising fluorescein, brilliant blue, acridine orange or a combination thereof. The dye is preferably in the range of 1-2%.
[049] The inorganic compound used in the process for making the composition is selected from the group comprising zinc carbonate, titanium dioxide,molybdenum oxide or a combination thereof. Preferably, the inorganic compound is in the range of 95-97%. The crystal unit cell volume is from 250 A or more, the crystal unit cell volume of zinc carbonate is 281.68 A and for molybdenum oxide is 280 A.
[050] The adhesive agent used in the process of forming the composition is selected from rosin, talc or a combination thereof. Preferably, the adhesive agent is in the range of 1-2%.
[051] In one embodiment of the present invention, the detergent is preferably sodium dodecylbenzenesulfonate.
[052] The suspension composition as described in the aforesaid embodiments are used in a method for developing existing latent impression marks on wet or dry article. The method comprises of spraying the composition in suspension form comprising at least one dye, at least one inorganic compound having crystal unit cell volume from 250 A or more , at least one adhesive agent and at least one detergent on the surface of an article. The article is allowed to stand for few seconds and then washed with water. After washing, the article is dried and illuminated with radiation having wavelength in the range of 500-550 nm to obtain clear and sharp impression marks.
[053] A unique feature of the compositions of the present invention is that they can develop clear and sharp impression marks on wet surfaces as well as dry surfaces, which otherwise is very difficult to obtain.
[054] The advantage of selecting the specific crystal unit cell volume from 250 A or more is that it develops sharp and clear impression marks on a wet article, on evidence buried under soil/snow or on articles collected from arson sites. The inorganic compounds, adhesive agents along with the dye help in clear and sharp development of images. The selection of specific crystal unit cell volume of the inorganic compound aids in the strong adherence of the adhesive agent and dyes to develop clear impression marks.
[055] Impression developed in Fig.2 using the composition of 4.3 gram of Zinc Carbonate, 0.027 gram of fluorescein and 1.1 gram of Rosin of the present invention is more sharp, clear and detailed than impression developed in Fig.1 using conventional composition.
[056] Also, intense fluorescence is seen in Fig.4 using the composition of 4.3 gram of Zinc Carbonate, 0.027 gram of fluorescein and 1.1 gram of Rosin of the present invention as compared to weak fluorescence as seen in Fig.3 using known composition.
[057] The compositions according to the present invention have wide applicability which makes them commercially utilizable. The compositions have broad-spectrum applications for developing latent impression marks and works on crime scene evidence that has been deliberately or accidently despoiled. The compositions according to the present invention help the investigation team to investigate at any crime scene more efficiently. The same composition can be used at different crime scenes thus making it multipurpose.
[058] The composition shows unique properties of applicability to develop impression marks on dry as well as wet surfaces, as the components of the composition can adhere to the impression marks in both circumstances. The composition can enable a fingerprint development on articles which have been underwater for up to 36 hours. As impression marks on crime scenes are subjected to a varied range of environmental conditions and water being a very common despoiler of fingerprints, a composition which overcomes such undesirable conditions is essential.
[059]The composition is unique as it develops –
Fresh and old impression marks on evidence collected from crime scenes.
Impression marks on evidences that have been set afire.
Impression marks on evidences that have been accidently or deliberately wetted.
Impression marks on evidence that has been buried under soil/snow.
Weak and faint impression marks.
[060] The composition can be chosen from the powder or liquid form depending on the situation. The composition is non-toxic, which makes it safe to use, and develops sharp and clear fingerprints thus making it reliable. The composition is able to detect fingerprints on a wide range of articles such as paper, metals, plastic, polymeric, glass, ceramics, laminates or wood. The composition can be used on smooth or rough surfaced and wet or dry articles.
[061] The composition can detect the latent impression marks, which are old.
[062] The composition is stable for a long time that is more than a month. The composition develops latent fingerprints on different non-porous articles, after these have been dipped in water for up to 36 hours, or buried under soil for up to 12 hours or has been set on fire.
[063] The processes described to detect the impression marks according to the invention are easy to use and can be operated even by an amateurish person. The method does not require sophisticated or costly equipments.

[064] Experimental results:
Various combinations of the compositions as mentioned in the aforesaid embodiments were evaluated for the development of latent fingerprints. The experiments were carried out according to the criteria laid down by Scientific Working Group on Friction Ridge Analysis Study and Technology. The clarity and sharpness of developed fingerprints was gauged on the basis of ridge clarity and degree of fluorescence, on a scale ranging from 0 to 10.

Grade Ridge characteristics
10 Good fluorescence, clear ridges, no background noise
9 Poor fluorescence, clear ridges, light background noise
8 Good fluorescence, clear ridges, substantial background noise
7 Poor fluorescence, clear ridges but background smudging
6 Poor fluorescence, clear ridges but lack of contrast
5 Only a few clear ridges, background noise
4 Only a few ridge characters identifiable
3 Number of ridge characters less than that required for identification
2 Lack of ridge clarity due to high background noise
1 Entire print smudged
0 Prints not developed

Results for development of Freshly made Fingerprints:
Results recorded for various fresh fingerprints developed using the composition of the present invention. The powder composition comprises of dye in the range of 1-2%, inorganic compound in the range of 95-97% and adhesive agent in the range of 1-2%. The liquid composition comprises of 1-2% dye, 95-97% inorganic compound and 1-2% adhesive agent, 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water in the form of a spray composition.
Composition UV reading Surface Type Clarity of image Sharpness of image

ZnCo3 +Fluorescein+Talc 520 nm Dry 7 7
Wet 6 6
ZnCo3 +Fluorescein+Rosin 520 nm Dry 8 8
Wet 8 8
ZnCo3+Brilliant Blue+Talc 520 nm Dry 7 6
Wet 6 7
ZnCo3+Brilliant Blue+Rosin+ sodium dodecylbenzenesulfonate 520 nm Dry 8 9
Wet 8 9
ZnCo3+ Acridine Orange+Talc 520 nm Dry 7 7
Wet 7 8
ZnCo3+ Acridine Orange+Rosin 520 nm Dry 9 8
Wet 8 9


TiO2+ Fluorescein+Talc 520 nm Dry 7 6
Wet 7 6
TiO2+ Fluorescein+Rosin+ sodium dodecylbenzenesulfonate 520 nm Dry 9 9
Wet 8 8
TiO2+ Brilliant Blue+Talc 520 nm Dry 6 6
Wet 6 6
TiO2+ Brilliant Blue+Rosin 520 nm Dry 7 8
Wet 7 8
TiO2+Acridine Orange+Talc 520 nm Dry 6 6
Wet 6 6
TiO2+Acridine Orange+Rosin 520 nm Dry 8 8
Wet 9 8

TiO2+ ZnCo3+Fluorescein+Talc 505 nm Dry 6 6
Wet 7 6
TiO2+ ZnCo3+Fluorescein+Rosin+ sodium dodecylbenzenesulfonate
510 nm Dry 9 9
Wet 9 10
TiO2+ ZnCo3+Brilliant Blue+Talc 505 nm Dry 7 6
Wet 6 7

TiO2+ ZnCo3+Brilliant Blue+Rosin 510 nm Dry 8 9
Wet 9 8
TiO2+ZnCo3+Acridine Orange+Talc 505 nm Dry 5 6
Wet 5 6
TiO2+ZnCo3+Acridine Orange+Rosin 510 nm Dry 7 7
Wet 7 7

ZnCo3 +Fluorescein+ sodium dodecylbenzenesulfonate 550 nm Dry 8 8
Wet 8 9

ZnCo3+Brilliant Blue 550 nm Dry 7 7
Wet 7 7
ZnCo3+ Acridine Orange 550 nm Dry 7 7
Wet 7 8

TiO2 +Fluorescein 540 nm Dry 5 6
Wet 6 5
TiO2+Brilliant Blue 540 nm Dry 6 6
Wet 6 6
TiO2+ Acridine Orange 540 nm Dry 6 7
Wet 7 6

ZnCo3+TiO2 +Fluorescein+ sodium dodecylbenzenesulfonate 540 nm Dry 8 9
Wet 9 10
ZnCo3+TiO2+Brilliant Blue 540 nm Dry 8 8
Wet 8 8
ZnCo3+ TiO2+Acridine Orange 540 nm Dry 7 7
Wet 7 7

ZnCo3 +Talc Dry 6 7
Wet 6 6
ZnCo3+Rosin Dry 7 8
Wet 8 7

TiO2 +Talc Dry 6 5
Wet 5 6

TiO2+Rosin Dry 7 7
Wet 7 7

ZnCo3+TiO2 +Talc Dry 7 7
Wet 7 7
ZnCo3+TiO2+Rosin Dry 8 8
Wet 8 8

Talc+Fluorescein Dry 6 6
Wet 7 6
Talc+Brilliant Blue Dry 6 6
Wet 6 6
Talc+Acridine Orange Dry 6 6
Wet 6 6

Rosin+Fluorescein Dry 6 6
Wet 6 6
Rosin+Brilliant Blue Dry 5 6
Wet 6 6
Rosin+Acridine Orange Dry 6 6
Wet 6 6

Results for development of Old Fingerprints:
Results recorded for various old fingerprints developed using the composition of the present invention. The powder composition comprises of dye in the range of 1-2%, inorganic compound in the range of 95-97% and adhesive agent in the range of 1-2%. The liquid composition comprises of 1-2% dye, 95-97% inorganic compound and 1-2% adhesive agent, 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water in the form of a spray composition.

Composition UV reading Surface Type Number of hours since the impression of fingerprint on article Clarity of image Sharpness of image

ZnCo3 +Fluorescein+Talc 520 nm Dry 120 7 8
Wet 30 8 7
ZnCo3 +Fluorescein+Rosin 520 nm Dry 160 8 9
Wet 50 9 8
ZnCo3+Brilliant Blue+Talc 520 nm Dry 110 7 6
Wet 30 7 6
ZnCo3+Brilliant Blue+Rosin+ sodium dodecylbenzenesulfonate 520 nm Dry 130 7 7
Wet 32 7 7
ZnCo3+ Acridine Orange+Talc 520 nm Dry 100 6 6
Wet 20 6 7
ZnCo3+ Acridine Orange+Rosin 520 nm Dry 105 7 7
Wet 25 7 7

TiO2+ Fluorescein+Talc 520 nm Dry 110 6 7
Wet 35 7 6
TiO2+ Fluorescein+Rosin+ sodium dodecylbenzenesulfonate 520 nm Dry 115 7 7
Wet 35 7 7
TiO2+ Brilliant Blue+Talc
520 nm Dry 95 5 6
Wet 20 5 6
TiO2+ Brilliant Blue+Rosin 520 nm Dry 98 6 6
Wet 22 6 6
TiO2+Acridine Orange+Talc 520 nm Dry 90 5 6
Wet 20 5 6
TiO2+Acridine Orange+Rosin 520 nm Dry 93 6 6
Wet 22 6 6

TiO2+ ZnCo3+Fluorescein+Talc 505 nm Dry 115 6 7
Wet 25 7 6
TiO2+ ZnCo3+Fluorescein+Rosin+ sodium dodecylbenzenesulfonate 510 nm Dry 140 7 7
Wet 35 7 7
TiO2+ ZnCo3+Brilliant Blue+Talc 505 nm Dry 100 5 6
Wet 25 5 6
TiO2+ ZnCo3+Brilliant Blue+Rosin 510 nm Dry 115 7 7
Wet 30 7 7
TiO2+ZnCo3+Acridine Orange+Talc 505 nm Dry 85 5 6
Wet 15 6 5
TiO2+ZnCo3+Acridine Orange+Rosin 510 nm Dry 100 6 6
Wet 25 6 6

ZnCo3 +Fluorescein+ sodium dodecylbenzenesulfonate 550 nm Dry 130 7 8
Wet 30 8 7
ZnCo3+Brilliant Blue 550 nm Dry 115 6 6
Wet 28 6 6
ZnCo3+ Acridine Orange 550 nm Dry 100 5 5
Wet 20 6 5

TiO2 +Fluorescein 540 nm Dry 110 5 7
Wet 20 5 6
TiO2+Brilliant Blue 540 nm Dry 100 5 5
Wet 18 5 5
TiO2+ Acridine Orange 540 nm Dry 95 5 4
Wet 15 5 5

ZnCo3+TiO2 +Fluorescein+ sodium dodecylbenzenesulfonate 540 nm Dry 130 7 7
Wet 35 7 7
ZnCo3+TiO2+Brilliant Blue 540 nm Dry 120 6
Wet 25 6 6
ZnCo3+ TiO2+Acridine Orange 540 nm Dry 100 5 6
Wet 18 5 5


ZnCo3 +Talc Dry 155 7 7
Wet 30 7 7
ZnCo3+Rosin Dry 165 8 8
Wet 35 8 8

TiO2 +Talc Dry 85 5 5
Wet 18 5 5
TiO2+Rosin Dry 95 6 7
Wet 20 6 7

ZnCo3+TiO2 +Talc Dry 90 6 6
Wet 18 6 6
ZnCo3+TiO2+Rosin Dry 110 7 7
Wet 28 7 7

Talc+Fluorescein Dry 48 5 5
Wet zero nil nil
Talc+Brilliant Blue Dry 40 5 4
Wet zero nil nil
Talc+Acridine Orange Dry 36 4 4
Wet zero nil nil

Rosin+Fluorescein Dry 50 5 5
Wet zero nil nil
Rosin+Brilliant Blue Dry 42 4 4
Wet zero nil nil
Rosin+Acridine Orange Dry 38 4 4
Wet zero nil nil

The following examples illustrate the invention but are not limiting thereof.
[064] Method Of Preparing The Powder Composition
Example 1
The powder composition was prepared by suspending 4.3 gram of zinc carbonate in 50 ml distilled water. To the suspension 0.027 gram of fluorescein stain and 1.1 gram of rosin was added to form a solution. The solution was dried. It was then grinded to form the final powder composition.
Example 2
The powder composition was prepared by suspending 4.3 gram of zinc carbonate in 50 ml distilled water. To the suspension 0.027 gram of fluorescein stain and 1.1 gram of talc was added to form a solution. The solution was dried. It was then grinded to form the final powder composition.
Example 3
The powder composition was prepared by suspending 4.5 gram of Titanium dioxide in 50 ml distilled water. To the suspension 0.029 gram Acridine Orange stain and 1.0 gram Talc was added to form a solution. The solution was dried. It was then grinded to form the final powder composition.
Example 4
The powder composition was prepared by suspending 4.2 gram of Molybdenum Oxide in 50 ml distilled water. To the suspension 0.025 gram Brilliant Blue Stain and 1.2 gram Talc was added to form a solution. The solution was dried. It was then grinded to form the final powder composition.
Example 5
The powder composition was prepared by suspending 4.5 gram of a mixture of zinc carbonate and Titanium dioxide in 50 ml distilled water. To the suspension 0.028 gram Acridine Orange stain and 1.0 gram Talc was added to form a solution. The solution was dried. It was then grinded to form the final powder composition.
Method Of preparing The Liquid Composition

Example 6
The spray composition was prepared by suspending 4.5 gram of zinc carbonate in 50 ml distilled water. To the suspension 0.028 gram Fluorescein stain and 1.0 gram Rosin was added to form a solution. The solution was dried. It was then grinded to form a powder composition; 3.3 gram of the powder composition was thoroughly mixed with 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water to form the final spray composition.
Example 7
The spray composition was prepared by suspending 4.5 gram of zinc carbonate in 50 ml distilled water. To the suspension 0.028 gram Fluorescein stain and 1.0 gram Talc was added to form a solution. The solution was dried. It was then grinded to form a powder composition; 3.3 gram of the powder composition was thoroughly mixed with 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water to form the final spray composition.
Example 8
The spray composition was prepared by suspending 4.5 gram of zinc carbonate in 50 ml distilled water. To the suspension 0.028 gram Acridine Orange stain and 1.0 gram Talc was added to form a solution. The solution was dried. It was then grinded to form a powder composition; 3.3 gram of the powder composition was thoroughly mixed with 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water to form the final spray composition.
Example 9
The spray composition was prepared by suspending 4.3 gram of Titanium Dioxide in 50 ml distilled water. To the suspension 0.026 gram fluorescein stain and 1.0 gram Rosin was added to form a solution. The solution was dried. It was then grinded to form a powder composition; 3.5 gram of the powder composition was thoroughly mixed with 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water to form the final spray composition.
Example 10
The spray composition was prepared by suspending 4.5 gram of a mixture of Zinc carbonate and Titanium Dioxide in 50 ml distilled water. To the suspension 0.026 gram Brilliant Blue stain and 1.1 gram Talc was added to form a solution. The solution was dried. It was then grinded to form a powder composition; 3.4 gram of the powder composition was thoroughly mixed with 0.3ml of sodium dodecylbenzenesulfonate and 50 ml of water to form the final spray composition.
,CLAIMS:We Claim:
1. A composition for developing latent impression marks, the composition comprising of:
at least one dye;
at least one inorganic compound having crystal unit cell volume from 250 A or more, ; and
at least one adhesive agent.

2. A composition for developing latent impression marks, the composition comprising of:
at least one dye;
at least one inorganic compound having crystal unit cell volume from 250 A or more, ;
at least one adhesive agent; and
at least one detergent.

3. The composition as claimed in claim 1 or 2, wherein the dye is selected from fluorescein, brilliant blue, acridine orange or a combination thereof.

4. The composition as claimed in claim 1 or 2, wherein the inorganic compound is selected from Zinc carbonate, titanium dioxide, molybdenum oxide or a combination thereof.

5. The composition as claimed in claim 1 or 2, wherein the adhesive agent is selected from talc, rosin or a combination thereof.

6. The composition as claimed in claims 1 or 2, wherein the dye is in the range of 1-2%, the inorganic compound is in the range of 95-97%, the adhesive agent is in the range of 1-2% of the composition.

7. The composition as claimed in claim 2, wherein the detergent is, preferably sodium dodecylbenzenesulfonate.

8. The composition as claimed in claim 4, wherein the crystal unit cell volume is from 250 A or more, the crystal unit cell volume of zinc carbonate is 281.68 A and the crystal unit cell volume of molybdenum oxide is 280 A.

9. The composition as claimed in claim 8, wherein the ratio between the edges a and c of the unit crystal of the inorganic compound is from 1:3.23 or more.

10. The composition as claimed in claim 9, wherein the ratio between the edges a and c of the unit crystal of zinc carbonate is 1: 3.23 , the ratio between edges, a and c of the unit crystal of titanium dioxide is 1: 1.55 and the ratio between edges, a and c of the unit crystal of molybdenum oxide is 1:1.60.

11. A process for preparing a composition for developing latent impression marks, the process comprising the steps of:
suspending an inorganic compound , wherein the crystal unit cell volume is from 250 A or more, in water to obtain a mixture;
adding a dye and an adhesive agent to the mixture to obtain a solution; and
drying the solution to form a powder.

12. A process for preparing a spray composition for developing latent impression marks, the process comprising the steps of:
suspending an inorganic compound having crystal unit cell volume is from 250 A or more, in water to obtain a mixture;
adding a dye and an adhesive agent to the mixture to obtain a solution;
drying the solution to form a powder; and
mixing the powder with a detergent.

13. The process as claimed in claim 10 further comprising adding water to form a spray solution.

14. The process as claimed in claim 10, wherein the detergent is preferably sodium dodecylbenzenesulfonate.

15. The process as claimed in claim 9 or 10, wherein the dye is selected from fluorescein, brilliant blue, acridine orange or a combination thereof; the inorganic compound is selected from zinc carbonate, titanium dioxide, molybdenum oxide or a combination thereof and the adhesive agent is selected from talc, rosin or a combination thereof.

16. A method of developing latent impression marks on a dry or wet article, the method comprising the steps of:
applying the composition as claimed in claim 1 or claim 6 on a surface of the article having an impression mark; and
illuminating the surface with a radiation.

17. The process as defined in claim 14, wherein the radiation is in the range of 500-550nm.