It is a colorless liquid. Thioglycolic Acid and some salts and esters of Thioglycolic Acid, such as Ammonium Thioglycolate, Butyl Thioglycolate, Calcium Thioglycolate, Ethanolamine Thioglycolate, Glyceryl Thioglycolate, Isooctyl Thioglycolate, Isopropyl Thioglycolate,