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Inspecting the plate during the etch
The Ferric Chloride being rinsed off the plate |
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 EXT THE PLATE IS placed in a succession of etching baths. Etching begins in sequence in proportion to the thickness of the gelatin coating and the viscosity of the mordant (Ferric Chloride) bath. The viscosity of the Ferric Chloride controls the speed with which the solution penetrates the gelatin. The result is a plate with many minute reservoirs or cells of varying depths. During printing, the deeper cells hold more ink and thus transfer more ink to the paper, creating the darker areas of the image.
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