Acid Dyes are wter soluble anionic dyes that are applied to fibres such as silk, wool, nylon and modifies acrylic fibres from neutral to acid dye baths, attachment to the fibre is attributed.
Catonic dyestuff is a group of water soluble dyes with bright colors. They ionize into cationic ions in water solution and dye the fibers by forming ionic limkage with the acid groups on the fibers through the function of electric charge.