Concentrated photographic developer composition and method of ma

Details Concentrated photographic developer composition and method of ma Concentrated photographic developer composition and method of ma

1990-03-23

1991-01-22

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Developing

430438, 430450, 430458, 430464, 430465, 430466, 430490, 430491, 430493, G03C 530, G03C 524

Patent

active

049870602

ABSTRACT:
A concentrated alkaline photographic developer composition, packaged in a single part to be diluted with water to form a ready to use developing solution for silver halide photographic materials, which comprises dihydroxybenzene developing agents, inorganic alkali agnets, inorganic antioxidant agents, sequestering agents and antifoggants, wherein said inorganic antioxidant agents comprise Na.sub.2 SO.sub.3 (sodium sulfite) and K.sub.2 SO.sub.3 (potassium sulfite) in a molecular ratio of 1:1 to 1:3 in an amount of from 1.6 to 4 moles per liter, the molecular ratio between said inorganic antioxidant agents and the developing agents is from 1.50 and 4.00, and said concentrated developer composition has a specific gravity higher than 1.300 at 20.degree. C., and
a method of making a concentrated alkaline photographic developer composition, packaged in a single part to be diluted with water to form a ready to use developing solution for silver halide photographic materials, which comprises dihydroxybenzene developing agents, inorganic alkali agents, inorganic antioxidant agents, sequestering agents and antifoggants, characterized in that comprises the following steps:

REFERENCES:
patent: 2891861 (1959-06-01), Welliver
patent: 2893865 (1959-07-01), Welliver et al.
patent: 3467521 (1969-09-01), Frank et al.
patent: 3549370 (1970-12-01), Sykes et al.
patent: 3589902 (1971-06-01), Himmelmann et al.
patent: 3733199 (1973-05-01), Crough et al.
patent: 4619886 (1986-10-01), Okutsa

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