Processing solution for use as photographic developer bath and replenisher therefor
AssigneeGAF Corporation
InventorJohn R. Mertz
Life of this patent
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Abstract
An aqueous photographic processing solution useful as a photographic developer bath and as a replenisher therefor, consisting essentially of, per liter: ______________________________________ A 1-phenyl-3-pyrazolidone photographic developer 0.8 to 1.8g Hydroquinone or a derivative thereof 15 to 35g Bromide ion 0 to 4g Organic anti-foggant and film speed restrainer 7 to 26 mmol Alkaline material and buffer to provide a pH at 25.degree. C of 10.0 + 0.8 - 0.5. ______________________________________
Claims8
An aqueous photographic processing solution useful as a photographic developer bath for automatic processing of X-ray film and as a replenisher therefor, consisting essentially of, per liter:
- ______________________________________ A 1-phenyl-3-pyrazolidone photographic developer 0.8 to 1.8g Hydroquinone or a derivative thereof 15 to 35g Bromide ion 0 to 4g Organic anti-foggant and film speed restrainer 7 to 26 mmol Alkaline material and buffer to provide a pH at 25.degree. C of 10.0 + 0.8 - 0.5. ______________________________________
The automatic processing of exposed photographic silver halide X-ray film, wherein the imagewise exposed X-ray film is developed in a photographic developer bath comprising a photographic developer, an alkaline material and a buffer system to maintain the pH of the developer bath at a desired value, an organic anti-foggant and water, the developed X-ray film is fixed, washed and dried, and the developer bath is replenished by a replenisher solution to maintain constant the photographic properites of the developer bath during processing of a large quantity of exposed X-ray film, the improvement which comprises using a processing solution as both the developer bath and the replenisher solution consisting essentially of, per liter:
- ______________________________________ A 1-phenyl-3-pyrazolidone photographic developer 0.8 to 1.8 g Hydroquinone or a derivative thereof 15 to 36g Bromide ion 0 to 4g Organic anti-foggant and film speed restrainer 7 to 26 mmols Alkaline material and buffer to provide a pH at 25.degree.C of 10.0 + 0.8 - 0.5 ______________________________________
- ______________________________________ A 1-phenyl-3-pyrazolidone photographic developer 0.8 to 1.8g Hydroquinone or a derivative thereof 15 to 35g Bromide ion 0 to 4g Organic anti-foggant and film speed restrainer 7 to 26 mmol Alkaline material and buffer to provide a pH at 25.degree. C of 10.0 + 0.8 - 0.5. ______________________________________
Dependencies are inferred from the claim text.