The present invention relates to a compound of formula (I-0) or a salt thereof. The invention further relates to the use of such compound as a colouring agent. The invention also relates to a colouring composition comprising such compound.

The present invention relates to a recombinant bacterium genetically modified to produce anthranilic acid and being able to grow in a culture medium lacking tryptophan. It also relates to a method for producing anthranilic acid using said recombinant bacterium.

The present invention relates to the synthesis of dyes. More specifically, the present invention relates to a method for preparing optionally substituted indigo, the method comprising a step of reacting an optionally substituted anthranilic acid with glyoxylic acid under hydrogenation in the presence of a metal cata...