| 摘要 |
489,762. Photographic sensitive materials. ZEISS IKON AKT.-GES. Dec. 31, 1936, No. 35863. Convention date, Dec. 31, 1935. [Classes 98 (i) and 98 (ii)] A photographic plate or film capable of repeated use comprises a light-sensitive material of known kind which changes colour under the influence of light of a definite wavelength or spectral range and again changes colour under the influence of light of another wavelength or spectral range. The second change may consist in a reversal of the original change. Suitable light-sensitive bodies are the fulgides, e.g. triphenyl fulgide or diphenyl-o-nitrophenyl fulgide, and bodies of the hydrazone group. They may be applied to a support in a binding layer of gelatin, an albuminous substance, an alginate, a cellulose derivative, or an artificial resin. Alternatively an adhesive layer of waterglass, gelatin, or a superficially dissolved layer of cellulose ester may be used. The Specification as open to inspection under Sect. 91 comprises also the use of three substances which are turned blue-green, yellow and purple-red combined into a layer for colour photography and a printing apparatus comprising a lamp 1, Fig. 1 (Cancelled), condenser 2, negative holder 4, objective 5, holder for sensitive material 6, and interchangeable filters 7. This subject-matter does not appear in the Specification as accepted.
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