Photographic Reproduction Processes a Practical Treatise of the Photo Impressio
Photographic Reproduction Processes a Practical Treatise of the Photo Impressio
Peter C Duchochois
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A bath compounded with 30 parts of potassium bichromate, 1, 000 parts of water and 2 parts of aqueous ammonia, is used for printing negatives of the ordinary intensity, the tissue being then practically of the same sensitiveness, a silvered paper insolated to obtain a print not over-exposed. For intense negatives the ammonia should be discarded and replaced by the same quantity of chromic acid. The time of immersion has also a certain influence on the results. The less the tissue is allowed to ...absorb the solution the less sensitive it is, but also the more the tendency of the half tints to be washed off during the development. Generally the tissue should remain immersed until it lies flat and the edges just commence to curl up, unless white and black im- pressions are desired, but even then it is preferable to operate as said above, using a bath at 2 per cent. For use the bichromate bath should be cooled down to 15 deg. C. (59 deg. Fahr. ), and much lower in summer, say 10 deg. C. (50 deg.
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