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
DEVELOPMENT WITH HYDROQUINONE (QUINOL).
"The Barnet Book of Photography" by Various