Pyrogallol (pyrogallic acid, 1, 2, 3-trihydroxybenzene) - trihydric phenol is easily oxidized. Usually a colorless brilliant needles, darkening the air. Poisonous.
Pyrogallol is used in the manufacture of dyes for fur and hair; as a reducing agent in the org. synthesis, photographic developing agent, a substance absorbing analyzers, additive for lubricating oils.