Developing solutions for silver halide materials.

摘要

There is described a concentrated developer solution which comprises from 20 to 60g/litre of hydroquinone, from 0.5 to 3.0g/litre of a 1 - phenyl - 3 pyrazolidinone developing agent, from 300 to 500g/litre of potassium sulphite and which is buffered to a pH of from 8 to 10 with a buffering agent other than an alkanolamine and which comprises sufficient organic solvent other than an alkanolamine to dissolve the hydroquinone. Such a concentrated developing solution which contains a high concentration of potassium sulphite has when diluted a long useful life and produces images of low graininess.