. The book of photography; practical, theoretical and applied. PRINT FROM BLUE BLOCK ONLY. mh. PRINT COMBINING RED AND BLUE. CHEMISTRY OF CARBON COMPOUNDS USED IN PHOTOGRAPHY. 465 developers, but the most important is the jwraderivative, hydroquinone. Hydroquinone. Para-di,-liydroxy-benzene. This coiiipgygiBtefas first suggested as a}ihotographicd|^^HH|r by Captain Abney in1880. It ad^^^^^ftjk>wly than pyrogallol,and produce^lJHHjpSirH negatives. It ismost conveniently ^prepared by reducing abody known as quinone (obtained by oxidisinganiline CpHjNHp) with sulphurous acid. ^O, + H, Quino
. The book of photography; practical, theoretical and applied. PRINT FROM BLUE BLOCK ONLY. mh. PRINT COMBINING RED AND BLUE. CHEMISTRY OF CARBON COMPOUNDS USED IN PHOTOGRAPHY. 465 developers, but the most important is the jwraderivative, hydroquinone. Hydroquinone. Para-di,-liydroxy-benzene. This coiiipgygiBtefas first suggested as a}ihotographicd|^^HH|r by Captain Abney in1880. It ad^^^^^ftjk>wly than pyrogallol,and produce^lJHHjpSirH negatives. It ismost conveniently ^prepared by reducing abody known as quinone (obtained by oxidisinganiline CpHjNHp) with sulphurous acid. ^O, + H, Quinoue. O + H,SO., CeH,(0H)2 + H,SO^. Hydroquinone. Hydroquinone is di-morphous and dissolvesreadily in water. Its acjueous solution iscoloured brown with ammonia. Oxidisingagents convert it into quinone. Tri-hydroxy Derivatives of Benzene. These compounds exist in three isomericforms, produced, like the di-hydric phenols, bythe position of the hydroxy! groups in thebenzene molecule. OH OH HC C-OH H-C C-H OH I C ^\H-C C-H rtC C-OH HC C-OH HO-C C-OH V V V H I . Pyrogallol orPyrogallic acid. OH
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
