monochlorbenzene
used effectively as a solvent for vinyl resins in non-flammable lacquer coatings and inks, and is also a solvent for ethyl cellulose and other resins.
Pyrogallol or benzene-1,2,3-triol is a white crystalline powder and a powerful reducing agent. It was first prepared by Scheele 1786 by heating gallic acid. Alternate preparation is heating para-chlorphenoldisulphonic acid with potassium hydroxide.
(PIA) HYDROQUINONE C6H4(OH)2-Common photo- graphic developing agent para-dihydoxybenzene. HYPERFOCAL DISTANCE-The distance from the optical center of lens forward to the nearest plane in acceptable focus when the lens is focused at infinity distance.
regarding ethanol-- ethanol not explicitly labelled 200 proof has probably been denatured for tax reasons. While some ethanol is denatured with methanol, other denaturants which may be harmful to lens coatings include camphor, gasoline, benzene, ...
 See also: Exposure, Film, Image, Photograph, Color
  
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