Process for preparing a dyed biopolymer and products thereof

A process for the production of a dyed composite article comprising at least a layer of dyed biopolymer, comprising the following steps:

• a) providing at least one support material;
• b1) providing at least part of said support material with at least one biopolymer-producing microorganism by contacting at least part of said support material with at least one culture of microorganisms comprising said biopolymer-producing microorganism and culturing said biopolymer-producing microorganism to provide at least a biopolymer layer to said support material, wherein said microorganism produce said biopolymer layer on at least part of said support material;
• and
• b2) providing at least part of said support material with at least one dye-producing microorganism by contacting at least part of said support material including said biopolymer layer with at least one culture of microorganisms comprising said dye-producing microorganism and culturing said dye-producing microorganism to provide at least a dye to at least part of said biopolymer layer, wherein said microorganism produce said dye to dye at least part of said biopolymer layer, whereby a dyed composite article is obtained;
• wherein said biopolymer layer comprises a plurality of shades of a same color.