Cyan dye

Cyan dyes Cyan ex 272 Cyanex 301 Cyanex 302 Cyanex 921 Cyanex 923 Cyanex 925... 

Fig. 13. Cyan dye-forming couplers where X can be H, Cl, OAr, OR, or SAr. Ar is aryl. R and R are undefined organic segments.

Some cyan dyes derived from both naphthols and phenols are reported to show thermochromism, a reversible shift in the dye hue as a function of temperature. This can occur in a negative while prints are being made (65). 

Fig. 14. Masking coupler used in the cyan layer showing (—) the unwanted density to blue-green light that accompanies cyan dye formation matched by (- --) a complementary density to blue-green from the unreacted coupler, and (— — ) density to red light.

Pyrazolone dyes are particularly versatile yellow chromophores the yellow dye developer used in Polacolor, the first instant color film, was based on a pyrazolone dye. The stmctures of the three Polacolor dyes are shown in Figure 3. The study of azo dyes derived from 4-substituted 1-naphthols led to the chromophore used in the Polacolor magenta dye developer. The Polacolor cyan dye developer contained a 1,4,5,8-tetra-substituted anthraquinone as chromophore (20). 

Fig. 6. Color-shifting dye developers (a) yeUow dye developer [16044-30-7] that becomes magenta upon hydrolysis (b) cyan dye [50695-79-9] that becomes colorless upon protonation and (c) leuco form of a dye developer [50481-86-2] that becomes yellow upon hydrolysis and oxidation.

Red-sensitized silver halide layer Metallized cyan dye developer layer... 

Fuji Peel-Apart Film FP-100. In 1984 Fuji introduced FP-lOO, a peel-apart instant color film rated at ISO 100. The FP-lOO system uses a dye-release process similar to that used in the Fuji integral films. Figure 16b is a schematic cross section of FP-100, and Figure 11b (on the colored plate) is a micrograph of the unprocessed film in cross section. The negative stmcture includes a spacer layer between the red-sensitive layer and the cyan dye-releaser layer that it controls, similar to that shown in the FI-800 stmcture, but there are no spacers between the other emulsions and corresponding dye-releaser layers. 

Table 9. Examples of Cyan Dyes for Sublimation Thermal-Transfer Printing...

CVD processes, 24 746 CVS system flow, 10 33, 35 CW laser beam, 14 673, 674 Cyagard RF1204, 11 496 Cyan, CIE chromaticity diagram, 7 313, 315. See also Cyan dyes... 

Cyanamides, 3 157-171 23 107 economic aspects, 3 162-163 health and safety factors, 3 163-164 manufacture, 3 161 shipping and handling, 3 162 specifications and analysis, 3 163 Cyanate ester curing agents, 20 411 Cyanate ester resins, production of, 23 769 Cyanation, 9 313 Cyanazine, 23 321-322 Cyan couplers, in chromogenic chemistry, 19 252-253 Cyan dyes... 

Much research work has been done and continues to be done on the development of new dyes for this outlet. For instance, Avecia have a range of yellow magenta and cyan dyes, based on the ammonium salt principle above, which do show improved wet fastness properties. An alternative approach adopted by workers at Ilford, based on their experience in colour photography, involves the molecular tailoring and formulation of dyes which aggregate and hence have light fasmess properties nearer to pigments (Archiva Inks). 

The cyan dye (71) (52USP2612448) and the yellow dye (72) (62GEP1137626), both derived from 2-pyrazolin-5-ones, have been suggested for use in dye bleach materials. 

Opaque Ti02 layer Opaque carbon layer Cyan dye releaser Red sensitive reversal emulsion... 

Exercise 28-31 Write a reasonable stepwise mechanism for the formation of a cyan dye from 1-hydroxy-2-naphthalenecarboxamide in the overall reaction expressed by Equation 28-13 (review Section 26-1E). 

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