Developing solution and method for developing an exposed silver halide photographic material
US5593817A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1996 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Jan 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/383
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic developing solution and a method of developing silver halide materials in the said developing solution is disclosed, the said developing solution comprising hydroquinone in an amount from 0 to 30 g per litre, an auxiliary developer, and silver halide complexing agents in an amount from 0 to 50 g per litre, characterized in that said developer further comprises PA1 in amounts from 0.1 to 5 g per litre a compound corresponding to the formula (I), accompanied by charge compensating anions, EQU Z'N.sup.+ --R--N.sup.+ Z" (I) wherein at least divalent group R contains at least one oxyethylene group and wherein Z' and Z", being the same or different, are composed of enough atoms to form a heterocyclic aromatic 5- or 6-ring; and at least 1 g of a compound corresponding to the formula (II), a precursor thereof, a derivative thereof and/or a metal salt thereof ##STR1## wherein each of A, B and D independently represents an oxygen atom or NR.sup.1 ; X represents an oxygen atom, a sulphur atom, NR.sup.2 ; CR.sup.3 R.sup.4 ;C=O; C=NR.sup.5 or C=S; Y represents an oxygen atom, a sulphur atom, NR.sup.'2 ; CR.sup.'3 R.sup.'4 ; C=O, C=NR.sup.'5 or C=S; Z represents an oxygen atom, a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.