Process for forming positive tonable images using a photosensitive material containing at least one 1,4-dihydropyridine.

摘要

A process for the production of patterns that consist of powders and that are positive with respect to the original is described, according to which a light-sensitive layer containing at least one 1,4-dihydropyridine compound is exposed imagewise, treated with a strong acid, post-exposed diffusely to produce tacky areas, and is subsequently toned.