The aim of the Blue2Value joint project is to develop and demonstrate processes that produce valuable extractives for the natural dye industry from cyanobacterial residues. End-of-life substances such as CO2 and waste are to be converted into new starting products such as the natural dyes of phycobilisomes (phycocyanin, phycoerythrin) through photosynthesis and biomass production. The aim is to develop and test high-quality and recyclable natural colorants for plastics and other systems (e.g. nature-based starch and oil-alkyd emulsions). The new natural dye based on cyanobacterial proteins must be developed and characterized from scratch for an application technology process.