Tertiary amino contrast increasers for ultrahigh contrast silver halide recording material

摘要

Silver halide recording material for the production of negative images with ultrahigh contrast. Known silver halide recording materials for the production of negative images with ultrahigh contrast contain hydrazine compounds and contrast-increasing compounds (so-called boosters). A material with a new class of such boosters is being presented here, whereby they contain a sulfonyl urea, sulfonyl urethane or sulfuryl diamide group as well as a tertiary amino group in the molecule. The invention also comprises a process for the production of black-and-white negative images with ultrahigh contrast using the material according to the invention. It is especially useful for reproduction in the pre-press stage.