Pyrogallol is an organic compound with the formula C6H3(OH)3. It is a white solid although because of its sensitivity toward oxygen, samples are typically brownish.It is one of three isomeric benzenetriols.
P 2777 (OTTO) Pyrogallol, GR 99%+ Cas 87-66-1 - used as a developing agent in black-and-white developers, but its use is largely historical except for special purpose applications. (Hydroquinone is more commonly used today.).A metal-complexing benzene triol compound.