Dry gelatin ‘Photo-mechanical’ plates – their significance in the evolution of scientific & technical photography

Abstract

This literature review charts the early evolution of silver halide photographic technology in photo-mechanical printing for artwork reproduction. It concentrates on a key point in time around the 1890s and most specifically around 1895 as these dates are significant in this evolution. By this time dry gelatin Process and Half-tone plates were commercially available as an alternative to the wet collodion process and a comparison is made between these. The work contains references to the contemporary literature to aid further research and uses this to show how studies published on the spectral sensitivities and reciprocity behaviour of commercial products can provide an insight into the formulation of these materials. It places these products in context of the development of the photographic detection of X-rays and radioactivity and later products such as line film.

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