Trihydroxybenzene, a developer in photography is popularly called:

hypo

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pyrogallol

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phosphor

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autochrome

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Solution

The correct option is A pyrogallol
1,2,3-trihydroxy benzene is also called as pyrogallol. It is a benzenetriol. It is a reducing agent. It is used as a developer in photography.
It is also used as the coupling agent in printing. It is also used for making hair dyes.
So, the correct answer is 'pyrogallol'

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