The Photographic Image a Theoretical And Practical Treatise of the Development

Peter C Duchochois

The book The Photographic Image a Theoretical And Practical Treatise of the Development was written by author Peter C Duchochois Here you can read free online of The Photographic Image a Theoretical And Practical Treatise of the Development book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Photographic Image a Theoretical And Practical Treatise of the Development a good or bad book?

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It is strong and keeps well owing to the presence of DEVELOPMENT IN COLLODION PROCESS. 177 sulphuric acid preventing oxidation. A little alcohol should be added to it when it does not flow well.
2. Energetic Developer.
Ferrous sulphate . 40 parts.
Acetic acid No. 8 . 30 " . 20 " Copper acetate .
. . N " . 480 " This developer should be prepared several hours beforehand and heated to 25° C. For use. It develops rapidly, yielding soft nega- tives full of details. The silver bath should be acidifi...ed with acetic acid, C. P.
If, instead of acetate, 1J parts of sodium formate and 3 parts of formic acid are added, the most powerful developer employed in the wet collodion process is obtained.
3. Weak Developer. Ferrous sulphate . 15 to 20 parts. Acetic acid No. 8 . . . 45 '* Sulphuric acid . . . . 2 " Water 480 " 4. Developer for Line work8. (Engravings, Etc. ) Ferrous sulphate . . C 25 parts. Tartaric acid . ■ . 4 to 5 " Water 480 " Alcohol quant. 8uff.
178 THE PHOTOGRAPHIC IMAGE.
This developer kept in the light does not oxidize.

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