• Webster's Revised Unabridged Dictionary
    • n Hydroquinone (Chem) A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene.
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Century Dictionary and Cyclopedia
    • n hydroquinone A divalent phenol (C6H4 (OH)2) prepared by the oxidation of aniline and treatment of the quinol formed with sulphurous acid. It is a crystalline substance with a sweet taste, and is readily soluble in hot water. It is much used in place of pyrogallic acid as an agent for the development of photographic plates. Also hydrochinon and ericinone, and more properly hydroquinol.
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Webster's Revised Unabridged Dictionary
Hydro-, 2 + quinone,


In literature:

Hydroquinone was obtained by Caventou and Pelletier by heating quinic acid, but these chemists did not recognize its true nature.
"Coal" by Raphael Meldola
When hydrolyzed by mineral acids or emulsin, it yields glucose and hydroquinone.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
Arbutin, C12H16O7, which occurs in bearberry along with methyl arbutin, hydrolyses to hydroquinone and glucose.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2" by Various
Hydroquinone as a developer was introduced this year by Eder and Toth, but it did not make much progress at first.
"The Evolution of Photography" by John Werge
"The Barnet Book of Photography" by Various

In news:

Rhodia has announced plans to increase its worldwide production capacity of hydroquinone by 20 percent, especially at Rhodia Zhenjiang unit in China by 2012.