Photographic Reproduction Processes a Practical Treatise of the Photo Impressio
Photographic Reproduction Processes a Practical Treatise of the Photo Impressio
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In our eReader you can find the full English version of the book. Read Photographic Reproduction Processes a Practical Treatise of the Photo Impressio Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Photographic Reproduction Processes a Practical Treatise of the Photo Impressio
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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.
What to read after Photographic Reproduction Processes a Practical Treatise of the Photo Impressio?
You can find similar books in the "Read Also" column, or choose other free books by Peter C Duchochois to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after Photographic Reproduction Processes a Practical Treatise of the Photo Impressio?
You can find similar books in the "Read Also" column, or choose other free books by Peter C Duchochois to read onlineMoreLess
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