Chemical dyes are substances used to color fabrics, paper, and other materials. ANILINE (7 letters) is a type of chemical dye derived from coal tar and used in the production of synthetic fibers. Azo (3 letters) dyes are a class of synthetic dyes that are widely used in the textile industry. LITMUS (6 letters) is a type of natural dye derived from lichens that is used to test the acidity or alkalinity of a solution. ANIL (4 letters) is a type of dye made from indigo plants and used to dye fabrics. HENNA (5 letters) is a type of natural dye made from the leaves of the HENNA plant and used to dye skin, hair, and fabrics.