Dark Blue Powder, Colour Index No. 61585 & CAS Registry No. 4474-24-2 Dye Content 85.0% - 90.0% Dye Strength 350 - 400% Used in: As a dye in cleaning products and detergents (strongly alkaline and strongly acidic) To colour inks, paints, and plastics used in printing. Drugs Textiles personal care products (tattoo inks, hair dye, shampoos, perfumes, soaps, lotions, toothpastes) food colorants â?? sea food additive inks for printing cosmetics Soap - cold process / melt and pour. Dyeing of wool and nylon.