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Investigations on the Theory of the Photographic Process

Samuel Edward Sheppard

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Description:This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ... but little reversibility, while the quinone seems stable. At present the interaction of organic reducer, sulphite, alkali, and atmospheric oxygen offers some interesting problems. 1 Chem. Soc. Trans., 1902, 81. I. Ber., 1901, 34. 3606. 'Trans. Chem. Soc., 1903, June. Sulphites have long been added to organic developers as lessening their tendency to aerial or autoxidation, and preventing the staining of the gelatine in development. This action was ascribed to a selective oxidation of the sulphite first to sulphate, the reducer being passed by. But the investigations of Bigelow, S. W. Young, and Titoff,1 have shown that the oxidation of sodium sulphite in solution is greatly retarded by the presence of small quantities of substances acting as negative catalysers. Messrs. Lumiere and Seyewetz have further shown that organic developers behave in this manner, so that we have here a case of an "induced" or "coupled" reaction2 in which the total reaction is retarded. While the oxidation of sodium sulphite accelerates that of sodium arsenite, here are two oxidations which both proceed far more slowly when the two substances are present together. It appears probable that this result is due to a cycle of changes. Thus, the negative catalysis with sodium sulphite has been shown to be due to the inhibition of positive catalysis (Titoff, loc. at.), while the interaction of sulphite with quinones or quinonoid bodies probably accounts for the anti-oxidising action of this, as well as its prevention of staining, since the coloured bodies giving rise to this would probably be of a quinonoid structure. The oxidation of p-phenylenediamine and p-aminophenol in ethereal solution with dry silver oxide yields di-and monoimido-quinone...We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Investigations on the Theory of the Photographic Process. To get started finding Investigations on the Theory of the Photographic Process, you are right to find our website which has a comprehensive collection of manuals listed.
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Pages: —

Format: PDF, EPUB & Kindle Edition

Publisher: Rarebooksclub.com

Release: 2012

ISBN: 1153497107

Description: This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ... but little reversibility, while the quinone seems stable. At present the interaction of organic reducer, sulphite, alkali, and atmospheric oxygen offers some interesting problems. 1 Chem. Soc. Trans., 1902, 81. I. Ber., 1901, 34. 3606. 'Trans. Chem. Soc., 1903, June. Sulphites have long been added to organic developers as lessening their tendency to aerial or autoxidation, and preventing the staining of the gelatine in development. This action was ascribed to a selective oxidation of the sulphite first to sulphate, the reducer being passed by. But the investigations of Bigelow, S. W. Young, and Titoff,1 have shown that the oxidation of sodium sulphite in solution is greatly retarded by the presence of small quantities of substances acting as negative catalysers. Messrs. Lumiere and Seyewetz have further shown that organic developers behave in this manner, so that we have here a case of an "induced" or "coupled" reaction2 in which the total reaction is retarded. While the oxidation of sodium sulphite accelerates that of sodium arsenite, here are two oxidations which both proceed far more slowly when the two substances are present together. It appears probable that this result is due to a cycle of changes. Thus, the negative catalysis with sodium sulphite has been shown to be due to the inhibition of positive catalysis (Titoff, loc. at.), while the interaction of sulphite with quinones or quinonoid bodies probably accounts for the anti-oxidising action of this, as well as its prevention of staining, since the coloured bodies giving rise to this would probably be of a quinonoid structure. The oxidation of p-phenylenediamine and p-aminophenol in ethereal solution with dry silver oxide yields di-and monoimido-quinone...We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Investigations on the Theory of the Photographic Process. To get started finding Investigations on the Theory of the Photographic Process, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Investigations on the Theory of the Photographic Process

Investigations on the Theory of the Photographic Process

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