Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Developing
Patent
1997-11-06
1999-12-07
Le, Hoa Van
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Developing
430440, 430446, 430480, 430483, G03C 530
Patent
active
059981105
ABSTRACT:
A black-and-white aqueous alkaline photographic developer composition is described which is free of dihydroxybenzene developing agent and comprises a p-aminophenol primary developing agent and an auxiliary superadditive 3-pyrazolidone developing agent, wherein the p-aminophenol primary developing agent is represented by the following formula: ##STR1## wherein R.sub.1, and R.sub.2, which may be the same or different, each represents a hydrogen atom, an alkyl group, or R.sub.1, and R.sub.2 together represent the carbon atoms required to complete a 5-membered saturated ring, R.sub.3 represents a hydrogen atom, an alkyl group or an alkoxy group, n represents 0 or 1, and HX represents HCl or 1/2 H.sub.2 SO.sub.4.
A process for forming a black-and-white photographic silver image comprising developing a silver halide photographic element with the black-and-white aqueous alkaline photographic developer composition is also described.
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Ferrania S.p.A.
Le Hoa Van
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