Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Developing
Patent
1993-03-03
1998-07-07
Chea, Thorl
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Developing
430422, 430423, 430428, 430429, 430430, 430460, 430461, G03C 500, G03C 1295
Patent
active
057766665
ABSTRACT:
A method of accelerating black and white development comprising contacting a negative-type silver halide photographic element during processing with a developer prebath or a developer bath comprising an accelerator compound of the formula: ##STR1## is disclosed, wherein R.sub.1, R.sub.2, and R.sub.3 are substituents; said R.sub.1, R.sub.2, and R.sub.3 may further combine with each other to form a 5-, 6-, or 7-membered ring; and wherein said developer prebath and developer bath do not contain any iron(III) ion complex salt having bleaching activity.
A bath selected from the group consisting of developer prebaths and developer baths for black and white development of a negative-type silver halide photographic element comprising an aqueous solution of accelerator compound of the formula: ##STR2## is also disclosed, wherein R.sub.1, R.sub.2, and R.sub.3 are substituents; said R.sub.1, R.sub.2, and R.sub.3 may further combine with each other to form a 5-, 6-, or 7-membered ring; with the proviso that said developer prebath and developer bath do not contain any iron(III) ion complex salt having bleaching activity or any nucleating agent capable of chemically fogging a negative-type silver halide emulsion; and said accelerator compound is present in an amount between 10.sup.-8 and 10.sup.-1 moles/L.
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Patent Abstract of Japan, vol. 12, No. 12, Apr. 1988 (JP 62/253161).
Altland Henry Wolf
Herz Arthur Herman
Texter John
Chea Thorl
Eastman Kodak Company
Leipold Paul A.
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