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Photographic Reproduction Processes   By:

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Photographic Reproduction Processes

A Practical Treatise of the Photo Impressions Without Silver Salts By P.C. Duchochois

New York The Scovill & Adams Company 423 Broome Street. 1891

CONTENTS

INTRODUCTION. THE DESIGNS. THE CYANOTYPE OR BLUE PROCESS. THE CYANOFER. (Pellet's Process.) THE BLACK OR INK PROCESS. (Ferro tannate Process.) THE CUPROTYPE. (Burnett's Process.) THE ANILINE PROCESS. THE PRIMULINE OR DIAZOTYPE PROCESS. TRACING PROCESS ON METAL. GRAPHOTYPY. THE URANOTYPE. THE PLATINOTYPE. ARTIGUES' PROCESS THE CARBON PROCESS. APPENDIX.

ILLUSTRATIONS

A Tournette Chardon's method of coating

PREPARER'S NOTE

Please remember that this book was published over a century ago, long before today's chemical safety standards. Please get expert advice before attempting to perform any of the procedures described in this book.

AUTHORS QUOTED

Artigues. Bevan, E.J. Bingham Borlinetto Brasseur, Chs. Buckle. Burnett, C. J. Chardon Cheysson Colas. Cooper, H. Cross, C. F. De la Blanchère, H. De St. Florent Draper, Dr. John Ducos du Hauron Dumoulin, E. Endemann,H. Fisch, A. Godefroy. Green, A. G. Graubassi Harman, Alfred. Herschel, Sir John. Houdoy Hübl, Baron. Hunt, Robert Liesegang, Dr. L. Loeffler, J. Monckhoven, Dr Von. Nièpce, de St. Victor Obernetter, J. B. Pellet. Persoz. Phipson, Dr. Pizzighelli, Captain J. Poitevin, A. Roy, Paul Sella, V. J. Smee, Professor Stephanowski, Karl. Swan, J. W. Willis, William Wothly, J. X.

INTRODUCTION.

The photographic processes with the salts of iron are all derived from the researches of Sir John Herschel. The investigations of that great philosopher are so valuable, so full of instructions that we are led to reprint them, together with those of Mr. C. J. Burnett, on the salts of uranium, etc., as an Introduction. It will be seen that the process by which blue prints are to day obtained is exactly that Sir John Herschel devised in 1840.

"It is no longer an insulated and anomalous affection of certain salts of silver or gold, but one which, doubtless, in a greater or less degree, pervades all nature, and connects itself intimately with the mechanism by which chemical combination and decomposition is operated. The general instability of organic combinations might lead us to expect the occurrence of numerous and remarkable cases of this affection among bodies of that class, but among metallic and other elements inorganically arranged, instances enough have already appeared, and more are daily presenting themselves, to justify its extension to all cases in which chemical elements may be supposed combined with a certain degree of laxity, and so to speak in a tottering equilibrium . There can be no doubt that the process, in a great majority, if not in all cases, which have been noticed among inorganic substances, is a deoxidizing one, so far as the more refrangible rays are concerned. It is obviously so in the cases of gold and silver. In the case of the bichromate of potash it is most probable that an atom of oxygen is parted with, and so of many others. A beautiful example of such deoxidizing action on a non argentine compound has lately occurred to me in the examination of that interesting salt, the ferrosesquicyanuret of potassium described by Mr. Smee in the Philosophical Magazine , No. 109, September, 1840, and he has shown how to manufacture in abundance and purity, by voltaic action on the common or yellow ferrocyanuret. In this process nascent oxygen is absorbed, hydrogen given off, and the characters of the resulting compound in respect of the oxides of iron, forming as it does Prussian blue with proto salts, indicate an excess of electro negative energy, a disposition to part with oxygen, or which is the same thing, to absorb hydrogen (in the presence of moisture), and thereby to return to its pristine state, under circumstances of moderate solicitation, such as the affinity of protoxide of iron (for instance) for an additional dose of oxygen, etc... Continue reading book >>




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