21 августа, 2015 
Malyar Triphenylmethane leuco dyes are used for photographic materials. The photographic system requires a polymer binder such as acrylic acid-methyl methacrylate copolymer115 or a copolymer of isophthalic and terephthalic acids116; a sensitizer such as 4-(4-n-amyloxyphenyl)-2,6-bis(3-ethylphenyl)- thiapyrilium perchlorate,117 a photo initiator such as hexaarylbisimi — dazole,118 and phenyl tribromomethyl sulfone, cycloalkane such as 1,2,3, 4,5-pentabromo-6-chlorocyclohexane,119 or 3-benzylidene-9-methyl-2,3-di — hydro-1 #-cyclopenta[b]quinoline.120
The redox system consists of pyrene or 9,10-phenanthrene quinone as oxidant and an alkyl ester of 3,3′,3"-nitrilopropionic acid as reductant.121 This system deactivates oxidation by bisimidazole when irradiated at 380-550nm, since the quinone is reduced to hydroquinone and thus stabilizing the previously generated dye image.122,123
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