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The perspective of the BioNaD project will focus to demonstrate and promote the use of innovative dyes (or colorants) for the leather industry, with the goals of demonstrating new and environmentally friendly substances for a sustainable development. The goal of the project will be pursued specifically, by demonstrating the reliability and efficacy of an original, publicly known and already validated concept: the process of "naturalization", that is the chemical transformation of water insoluble dyes into water-soluble species, capable of replacing the actual commercial dyes. Technically, the naturalization is achieved by linking chemically a synthetic dye to the sugar lactose, creating a new and independent chemical species possessing unique properties. One objective of the proposal is to reduced significantly (90%), or possibly eliminate (100%), the amount of chemicals associated to the use of dyes for leather. Commercial dyes contain auxiliary chemicals in the range of 10 - 200% on..