Alkaline black-and-white developer for silver halide photographic material
AssigneeMinnesota Mining and Manufacturing Company
InventorsCarlo Marchesano, Filippo Faranda, Franco Buriano
Life of this patent
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Abstract
The present invention relates to an alkaline aqueous black-and-white photographic developer composition comprising: (1) at least one black-and-white developing agent, (2) at least one black-and-white auxiliary developing agent, (3) at least one antifoggant, (4) at least one sequestering agent, (5) a sulfite antioxidant, (6) at least one buffering agent, (7) a tone agent, and (8) at least one tone promoting agent, wherein said tone agent is a primary organic amine compound and said tone promoting agent is a silver halide solvent.
Claims21
An alkaline black-and white x-ray film photographic developer composition having a pH of greater than 10 comprising:
- (1) 2 to 100 grams per liter of at least one black-and-white developing agent,
- (2) 0.1 to 20 grams per liter of at least one black-and-white auxiliary developing agent,
- (3) 0.01 to 5 grams per liter of at least one antifoggant,
- (4) 1 to 60 grams per liter of at least one sequestering agent,
- (5) a sulfite antioxidant capable of generating 0.1 to 1.25 moles per liter of sulfite ions,
- (6) at least one buffering agent in a molar ratio of greater than 0.5:1 with respect to said sulfite antioxidant,
- (7) a tone agent,
- (8) a tone promoting agent,
- wherein said tone agent is 1.times.10.sup.-3 to 2 moles per liter of a primary organic amine compound and said tone promoting agent is 0.01 to 50 mMoles per liter of a silver halide solvent.
An alkaline black-and white x-ray film photographic developer composition having a pH of greater than 10 consisting essentially of:
- (1) 2 to 100 grams per liter of at least one black-and-white developing agent,
- (2) 0.1 to 20 grams per liter of at least one black-and-white auxiliary developing agent,
- (3) 0.01 to 5 grams per liter of at least one antifoggant,
- (4) 1 to 60 grams per liter of at least one sequestering agent,
- (5) a sulfite antioxidant capable of generating 0.1 to 1.25 moles per liter of sulfite ions,
- (6) at least one buffering agent in a molar ratio of greater than 0.5:1 with respect to said sulfite antioxidant,
- (7) a tone agent,
- (8) a tone promoting agent,
- wherein said tone agent is 1.times.10.sup.-3 to 2 moles per liter of a primary organic amine compound and said tone promoting agent is 0.01 to 50 mMoles per liter of a silver halide solvent.
Dependencies are inferred from the claim text.