Coal tar dyes are formed during the dilution of bituminous coal with hydrocarbon solvents. When coal is diluted with the solvents, it produces a variety of vibrant colored byproducts.  Coal tar dyes contain compounds that are known or suspected to be carcinogens, such as carcinogens, such as benzene, toluene, naphthalene, anthracene, xylene, creosote oils and benzo[a]pyrene, which is a polycyclic aromatic hydrocarbon (National Toxicology Program and the International Agency for Research on Cancer). Many coal tar dyes have been banned or restricted by regulatory agencies due to their potential health risks. In both the US and EU, certain coal tar dyes are not allowed for use in cosmetics. Additionally, coal tar dyes contain heavy metals and chemical solvents, and have the ability to bioaccumulate. The production and disposal of these dyes may contribute to water pollution and other environmental concerns. Coal tar dyes linked with skin cancer and emotional/sleep disturbances