The Chemistry of Photography
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In our eReader you can find the full English version of the book. Read The Chemistry of Photography 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 The Chemistry of Photography
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129 called before we can leave emulsion photography- It has been found that ammonia acts in the same way as heat in causing the silver bromide to acquire its sensitive condition. There are different ways of working this process, and there are numerous formulae into the details of which I can- not now enter but for which I must refer you to the practical treatises. As a point of history it should be mentioned that the ammonia process of ripen- ing has been developed chiefly by Van Monck- hoven a...nd by Eder and Pizzighelli. With respect to manipulation it will suffice to state that in the preparation of such an emulsion, we may add an ammoniacal solution of silver nitrate to a solution of potassium bromide in aqueous gelatine and ripen the mixture at a gentle heat ; or the emulsion may be first partially ripened in the usual way, and then the sensitiveness of the silver haloid brought up to the desired stage by the addition of ammonia, and continuing the digestion for a short time at a lower tem- perature.
What to read after The Chemistry of Photography?
You can find similar books in the "Read Also" column, or choose other free books by Raphael Meldola to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
129 called before we can leave emulsion photography- It has been found that ammonia acts in the same way as heat in causing the silver bromide to acquire its sensitive condition. There are different ways of working this process, and there are numerous formulae into the details of which I can- not now enter but for which I must refer you to the practical treatises. As a point of history it should be mentioned that the ammonia process of ripen- ing has been developed chiefly by Van Monck- hoven a...nd by Eder and Pizzighelli. With respect to manipulation it will suffice to state that in the preparation of such an emulsion, we may add an ammoniacal solution of silver nitrate to a solution of potassium bromide in aqueous gelatine and ripen the mixture at a gentle heat ; or the emulsion may be first partially ripened in the usual way, and then the sensitiveness of the silver haloid brought up to the desired stage by the addition of ammonia, and continuing the digestion for a short time at a lower tem- perature.
What to read after The Chemistry of Photography?
You can find similar books in the "Read Also" column, or choose other free books by Raphael Meldola to read onlineMoreLess
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