| 摘要 |
1332846 Electro-phoretically depositing silver salts or complexes EASTMAN KODAK CO 19 April 1971 [19 March 1970] 24559/71 Heading C7B [Also in Division G2] Photographic materials are prepared by immersing a pair of electrodes in a dispersion of a silver salt, or silver sensitizing dye complex crystals in a liquid and applying a potential so that crystals deposit on one electrode. Preferably a silver halide (which may be spectrally sensitized) or a complex silver salt of a sensitizing dye is dispersed in an insulating liquid (e.g. nitromethane or distilled water) optionally containing a surfactant or ionic dye, and is deposited on an electrode of metal, glass coated with Ti or Au or plastics coated with Ti and Au using an electrode spacing of 5 - 10 mm and a potential of 5 - 1500V. The Examples describe the deposition of (1) a gelatino Ag Br emulsion which has been decanted and washed with nitromethane and isopropanol, (2) sensitized precipitated Ag Br, (3) AgBr obtained by enzymic removal of gelatine from an Ag Br emulsion, and (4) a gelatino Ag methin dye complex. The coated dye complex is exposed and physically developed in an aqueous solution of Na 2 SO 3 , Na isoascorbate, Na 2 CO 3 , an anium salt, Na 2 S 2 O 3 , AgCl and 5- methylbenzotriazole. Reference is also made to making mixed grain emulsion materials for use in colour reversal processes. |
