Claims
- 1. A process for forming a direct positive image, said process comprising subjecting a silver halide photographic material to (i) imagewise exposure and (ii) overall exposure before and/or during development, or surface development in the presence of a fogging agent, wherein the silver halide photographic material comprises a support and at least one silver halide emulsion layer comprising internal image type silver halide grains, each grain having a core/shell type structure comprising a conversion type silver halide core and a silver halide shell on said core, said grains not being previously fogged, the silver halide content of said shell being 30 to 40 mole percent based upon the total silver halide in said core and said shell.
- 2. The process of claim 1 wherein said conversion type silver halide core contains at least 80 mole percent of silver bromide and less than 10 mole percent of silver iodide.
- 3. The process of claim 1 wherein said conversion type silver halide core contains at least 90 mole percent of silver bromide and less than 5 mole percent of silver iodide.
- 4. The process of claim 1 wherein said silver halide emulsion layer contains a coupler.
- 5. The process of claim 1 wherein the surface of said shell is not chemically sensitized, and the silver halide emulsion layer coated on a support when exposed for a given time up to 1 second and then developed at 20.degree. C. for 4 minutes with internal developing solution B, would produce a maximum density which is at least 5 times that which is obtained when developing said layer similarly exposed and then developed at 20.degree. C. for 4 minutes with surface developing solution A.
- ______________________________________Composition of the developing solution A:Methol 2.5 gl-Ascorbic acid 10 gNaBO.sub.2.4H.sub.2 O 35 gKBr 1 gWater to make 1 literComposition of the internal developing solution B:Methol 2 gSodium sulfite 90 g(anhydrous)Hydroquinone 8 gSodium carbonate 52.5 gKBr 5 gKI 0.5 gWater to make 1 liter______________________________________
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-35361 |
Mar 1979 |
JPX |
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Parent Case Info
This application is a Continuation of application Ser. No. 21,612, filed Mar. 2, 1987, now abandoned, which is a Continuation of application Ser. No. 779,300, filed Sept. 23, 1985, now abandoned, which is a continuation of Ser. No. 670,356, filed Nov. 9, 1984, now abandoned; which is a continuation of Ser. No. 559,839, filed Dec. 8, 1983, now abandoned; which is a continuation of Ser. No. 298,956, filed Sept. 3, 1981, now abandoned; which is a continuation of Ser. No. 132,522, filed Mar. 21, 1980, now abandoned; which claims the priority of Japanese Application No. 35361/1979, filed Mar. 26, 1979.
US Referenced Citations (11)
Continuations (6)
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21612 |
Mar 1987 |
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779300 |
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670356 |
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559837 |
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298956 |
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522 |
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