or benzene-1,2,3-triol is a benzenetriol. It is a white crystalline
powder and a powerful reducing agent.
- It was
first prepared by Scheele 1786 by heating gallic acid. An alternate
preparation is heating para-chlorophenol disulphonic acid with
- When in
alkaline solution, it absorbs oxygen from the air, turning purple
from a colourless solution.
- It can be
used in this way to calculate the amount of oxygen in air, notably
via the use of the Orsat apparatus.
- One can
find its uses in hair dying, dying of suturing materials and for
oxygen absorption in gas analysis.
- It also
has antiseptic properties. Pyrogallol was also 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.)
- Though a popular photographic developing agent in the 19th and early
20th centuries, pyrogallol largely fell out of favor around the
1920s, though still used by a few notable photographers including
- In those
days it had a reputation for erratic and unreliable behavior, due
possibly to its propensity for oxidation.
was tested in two independent bacterial mutation studies; both
studies gave positive results in one or more strains of S.
typhimurium or E. coli.
current main commercial application of pyrogallol is the production
of pharmaceuticals and pesticides.
analytical chemistry, pyrogallol is used as a complexing agent,
reducing agent, and, in alkaline solution, as an indicator of
was nominated for testing by private individuals based on its
frequent occurrence in natural and manufactured products, including
hair dyes, and the apparent lack of carcinogenicity data.
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