Chromogenic material

Cuprous iodomercurate [13876-85-2] Cu2Hgl4, is a bright red water-insoluble compound prepared by precipitation from a solution of K Hgl with cuprous chloride. It is used in temperature-indicating paints because it reversibly changes color to brown at 70°C (see Chromogenic materials). 

Other Uses. Photochromic glass contains silver chloride (80) and silver molybdate [13765-74-7] (81) (see Chromogenic materials). An apparatus coated with silver nitrate has been described for the detection of rain or snow (82). Treatment with silver-thiosulfate complex has been reported as dramatically increasing the post-harvest life of cut carnations (83). Silver sulfate has been used in the electrolytic coloring of aluminum (84). Silver sulfate also imparts a yellowish red color to glass bulbs (85). 

Chemical indicators for dry-heat steriliza tion are available either in the form of pellets enclosed in glass ampuls, or in the form of paper strips containing a heat-sensitive ink. The former displays its end point by melting, the latter by a color change (see Chromogenic materials). 

Chromogenic Materials, Photochromic" in ECT3d ed., VoL 6, pp. 121—128, by R. J. Aranjo, Corning Glass Works. 

H. J. Hoffmann, in C. M. Lampert and C. G. Granqvist, eds., Earge-yirea Chromogenics Materials and Devicesfor Transmittance Control Vol. IS 4, SPIE Institutes for Advanced Optical Technologies, Bellington, Wash., 1990, p. 86. 

The apphcation of a high electric field across a thin conjugated polymer film has shown the materials to be electroluminescent (216—218). Until recentiy the development of electroluminescent displays has been confined to the use of inorganic semiconductors and a limited number of small molecule dyes as the emitter materials. Expansion to the broad array of conjugated polymers available gives advantages in control of emission frequency (color) and facihty in device fabrication as a result of the ease of processibiUty of soluble polymers (see Chromogenic materials,electrochromic). 

Aegerter MA (1996) Sol-Gel Chromogenic Materials and Devices. 85 149-194 Ahrland S (1966) Factors Contributing to (b)-behavior in Acceptors. 1 207-220 Ahrland S (1968) Thermodynamics of Complex Formation between Hard and Soft Acceptors and Donors. 5 118-149... 

Color measuring instruments, 7 323-326 Color-order systems, 7 308-311, 325-326 Color perception, 7 303-304 Color photographic products, 19 197 Color photography, 19 231-272. See also Chromogenic materials additive, 19 284 additive mixing in, 19 240-241 dye stability in, 19 263... 

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