pyrogallol

A white, toxic crystalline phenol, C₆H₃(OH)₃, used as a photographic developer and to treat certain skin diseases.

A white crystalline compound, C₆H₃(OH)₃, obtained by the distillation of gallic acid, whence the name: also made synthetically. It is used as a photographic developer. The alkaline solution is sometimes used in gas analysis to absorb oxygen. It has a bitter taste, is poisonous, and melts at 132.5–133.5° C. Also called pyrogallic acid.

A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.

A poisonous trihydroxy phenol, 1,2,3-trihydroxybenzene, C6H3(OH)3, used is a photographic developer.

a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer