Photographic developing process
OwnerRobert E. Hutchinson, Jr.inventor
Life of this patent
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Abstract
A two-component system for developing photosensitive materials provides a developing process which is not highly dependent upon critical values of time and temperature. The resultant developed materials possess less graininess than might be expected with conventional developer systems. The two-composition system is comprised of a first and a second composition employed as aqueous solutions, each containing an alkali sulfite. The first compositon comprises a phenylamine developer compound and hydroquinone.
Claims1
A process for the development of photographic material initially containing silver halide to produce a silver image, said photographic material having been imagewise exposed to radiation, said process comprising:
- (a) uniformly treating said photographic material with a first aqueous solution having a pH between 7.5 and 12 and comprising
- ______________________________________ Component Weight Ratio ______________________________________ N--methyl-p-aminophenol sulfate 1.9-2.1 sodium sulfite 46-54 hydroquinone 4-8 ______________________________________
- said first solution containing between about 56 and 60 grams of said components per quart,
- (b) separating said photographic material from said first solution,
- (c) treating said photographic material uniformly with a second aqueous solution having a pH between 7.5 and 12 and comprising
- ______________________________________ Component Weight Ratio ______________________________________ borax 40-60 sodium sulfite 90-110 ______________________________________
- said second solution containing between about 130 and 170 grams of said components per quart,
- (d) separating said photographic material from said second solution,
- (e) fixing,
- (f) washing, and
- (g) drying said photographic material.
Dependencies are inferred from the claim text.