Naphthols are either of two crystalline monohydric alcohols, derived from naphthalene and belonging to the phenol family. The naphthols are position isomers; Alpha-naphthol (also called 1-naphthol) is 1-hydroxynaphthalene and Beta-naphthol (also called beta-naphthol) is 2-hydroxynaphthalene. The compound 1-naphthol is made by heating 1-naphthalenesulfonic acid with caustic alkali or by heating 1-naphthylamine with water under pressure. The compound 2-naphthol is manufactured by fusing 2-naphthalenesulfonic acid with caustic soda. They are used directly in making several dyes and are converted into numerous dye intermediates, as well as into tanning agents, antioxidants, and antiseptics.