Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Patent
1979-10-01
1981-05-12
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
430251, 430428, 430455, G03C 554, G03C 700, G03C 538
Patent
active
042672546
ABSTRACT:
There is described a photograhic method employing a positive-negative diffusion transfer film unit wherein there is formed a positive silver transfer image which may be viewed as a positive transparency without being separated from the developed negative silver image, including an embodiment wherein additive color projection positive images are formed. According to the method, the exposed film unit is developed by contacting the silver halide emulsion layer with a photographic processing composition which comprises an aqueous alkaline solution containing a silver halide developing agent and a silver complexing agent. The silver complexing agent is stable in an alkaline environment, has a melting point less than about 50.degree. C. preferably about 25.degree. C. or less, and the log of the stability constant (.beta.) for a 1:1 complex of the complexing agent with silver is at least about 10.5. The film unit is not washed during the method. According to the method of the invention crystal formation in the transparency is substantially or completely eliminated.
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patent: 4017314 (1977-04-01), Blake
patent: 4168166 (1979-09-01), Land
Pelissard et al., Tetrahedron Letters, vol. 45, 1972, pp. 4589-4592. _
Louis et al., Inorganic Nuclear Chem. Letters, vol. 13, 1977, pp. 31-35. _
Bloom, deceased Stanley M.
Sachdev Krishna G.
Maccarone Gaetano D.
Polaroid Corporation
Schilling Richard L.
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