Photographic variable contrast material.

摘要

There is described silver halide photographic black and white print material which comprises at least two silver halide emulsion components, the first of which has been spectrally sensitised so that it exhibits a log exposure range to minus blue light greater than 0.75 and to blue light less than 0.45 and the other silver halide components have a range of sensitivities to minus blue light the slowest of which is at least 0.4 Log E less sensitive to minus blue light. Preferably the slowest of which has at least 0.9 Log E less sensitivity to minus blue light.