Photographic developer. In manufacture of dyes, rubber antioxidants. Polymerization inhibitor, stabilizer. In skin-lightening creams; hair dyes. Found in coal tar effluent. An antioxidant in the rubber industry & as a developing agent in photography. Also an intermediate in the manufacture of rubber & food antioxidants & monomer inhibitors. Used as depigmenting agents to lighten skin. Associated with tobacco: reported either as a natural component of tobacco, pyrolysis product (in tobacco smoke), or additive for one or more types of tobacco products.