Alizarin Red is a term with multiple meanings. Here are two interpretations: Firstly, Alizarin Red is a widely-used azo dye, also known as 221 Violet Red powder. It is primarily used for coloring paints, inks, varnishes, leather, rubber, plastics, latex products, construction materials, printing inks, educational supplies, and cosmetics. Alizarin Red has a broad range of applications and is an important pigment in many industries. Secondly, Alizarin Red can also refer to Rhodamine B, a bright peach red synthetic basic fluorescent dye, also called Rose Red B or Basic Rose. Rhodamine B is mainly used in laboratory cell fluorescence stains, dyes, papermaking industry, manufacturing paints and pigments, and can also be used for dyeing fabrics and leather products. However, Rhodamine B has certain toxicity and genotoxicity, and international research institutions classify it as a Class 3 carcinogen, indicating its potential carcinogenicity to humans is questionable.