| 摘要 |
1,078,274. Photographic materials and transfer processes. INTERNATIONAL POLAROID CORPORATION. Aug.4, 1964 [July 25. 1963 (2)], No.31462/64. Heading G2C. A photographic transfer process comprises imagewise exposing a silver halide emulsion, developing the latent image with an alkaline developer composition, contacting the developed emulsion with a reflective sheet of metal to transfer the unexhausted alkali thereto and change the reflective or polarizing properties of the metal sheet. Preferably a photographic assemblage is used which is free from silver halide solvent comprising the silver halide emulsion, a rupturable container of alkaline developer and a reflective metal sheet so connected that the above process is carried out e. g. as in Specification 684, 592. In the examples, a reflective layer of aluminium on a transparent support is used so that the alkali unused in the development of the silver halide attacks and removes the aluminium to produce a negative transparency when viewed by transmitted light or a positive print when viewed by reflected light. The developer composition preferably contains 5-nitrobenzimidazole to increase density of the image on the aluminium layer. The finished print may be used as printing plate as the unaltered areas are oleophilic and the changed areas hydrophilic. Alternatively a polarizing aluminium sheet such as described in Specification 1, 008, 580 may be used as the receptor material and used to produce images as above. |
