... as optical brightener for wool, natural silk, polyamide fiber and acrylic fiber. Optical Brightener MDACMain Chemical Composition: Coumarin Derivatives Specification: ... as brightener of wool, natural silk, polyamide fiber and acrylic fiber. Process: Soluble with ethanol before adding.wool: 0 ... .05-0.35% polyamide fiber: 0.05-0.3%natural silk: 0.05-0.4% acrylic fiber: 0.05-0.8%Attention ...