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The photographic news
- Bandzählung
- 14.1870
- Erscheinungsdatum
- 1870
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 613, June 3, 1870
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Zeitschrift
The photographic news
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Band 14.1870
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- Titelblatt Titelblatt -
- Sonstiges Preface -
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- Register Index 619
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Band
Band 14.1870
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THE PHOTOGRAPHIC NEWS. Vol. XIV. No. 613.—June 3, 1870. CONTENTS. PAGE Matt Transparent Pictures.—Removing Collodion from Images Transferred to Paper, Ivory, Wood, etc 253 Photography for Wood Engraving 254 French Photographic Exhibition 255 Photographs with the Gift of Healing 255 American Correspondence 256 German Correspondence 257 On the Preparation, Printing, and Transfer of Carbon Tissue. By M. Gobert 258 Manipulations in Johnson’s Carbon Process 259 PAGE Collodio-Bromide Process. By M. Carey Lea 260 Weighing and Measuring. By M. Carey Lea 261 Extensive Photographic Piracy 261 Correspondence.—Cleaning Plates—Dr. Diamond “Re Paul Pretsch”—Red Deposit on Using Golden Syrup 262 Proceedings of Societies —New York Photographic Society- Amateur Photographic Association 263 Talk in the Studio 264 To Correspondents 264 MATT TRANSFERRED PICTURES.—REMOVING COLLODION FROM IMAGES TRANSFERRED I TO PAPER, IVORY, WOOD, ETC. The use of transferred collodion images lias of late become very general for many purposes, and the use of collodion as a means of transporting images in various processes is well known to experimentalists. For producing prints on ivory, collodion presents the readiest facilities. There is no method of enlargement more easily worked, or which gives better results, than camera printing in wet collodion. Collodion is indispensable in enamel processes; there is no better method of producing a photographic image on wood than it presents; and for placing images on the curved or irregular surfaces possessed by vases and other ornaments it possesses advantages which, as yet, few photographers have realized. But in many of the cases to which we have referred it is necessary, in order to secure the best result, that the collodion should be removed when the transfer is completed; and this removal has often presented difficul ties, the dried collodion film, especially in contact with gelatine and similar bodies, resisting the action of the ordin ary solvents with singular persistency. In some cases where transferred images are employed it is imperative that the collodion should be removed in order to complete the operations; and in many others where it is not absolutely necessary—as, for instance, in transferred collodion enlargements—an enormous improvement may be effected by its removal, leaving a fine matt image, in texture closely resembling a mezzotint engraving. There is a wide field, hitherto unworked, for the production of pictures of this kind in various tones, from rich brown to warm or neutral black, to methods of producing which we shall shortly call attention. In the meantime, as we des cribe in another column the use of cododion for placing photographic designs on wood for the engraver, we give a separate place to a necessary part of the process—the re moval of the film—because the operation in question is of general importance in relation to many processes which we shall shortly bring under the attention of our readers. There are two difficulties in removing the collodion film from images produced on collodion, the extent and exact nature of which can scarcely be understood by photo graphers who have not had experience in this direction. To those who have occasionally dissolved a collodion film, and lost a good negative by the use of a varnish made with stronger spirit than usual, allusions to the difficulty of dissolving dried collodion films must sound oddly enough. Nevertheless, the difficulty exists. The negative film which is dissolved by varnish is always in a slightly im perfect condition : the collodion used has not been of tough character, which should always be chosen for transfer pur poses ; but, besides this, the photographer who has met with this over-facility in films dissolving, remembers that the image dissolved also. It is true that the image is rest ing on the film, and, when the film dissolved, it was, of necessity, broken up into innumerable particles, floating away with the dissolved collodion. But it would, in the majority of cases, have been the same if the film had been uppermost, and the image resting on the glass. When the collodion has become quite desiccated, the metallic image is so firmly attached to it that it breaks up when the film dissolves; and as, in removing the film from a transferred image, it is desired that the picture shall remain intact on whatever surface it may rest, whilst the glazed film only is removed, a solution of the film with such conditions is worse than useless. As an illustration of the insolubility of the dried film, wc have just attempted to dissolve the collodion from an eburneum picture, which, as the reader knows, consists of a collodion image on a support of gelatine and oxide of zinc, the metallic picture being between the two films, and, of course, as much in contact with the gelatine as the collodion. We poured over the collodion surface ether and alcohol, repeatedly flooding it for about five minutes before any appearance of solution was manifest; at length the film began to break up, and the image with it, leaving not a vestige of the picture attached to the gelatine. The method we are about to describe, and which is due to Herr Grune, would have dissolved the collodion, and left the image intact as a black metallic powder attached to the gelatine surface. To remove the film without injuring the image pro ceed as follows:— First, take care that the film has been attached to its new support with collodion side uppermost, the side on which the deposit was produced by development and toning in contact with the surface upon which it is to remain. The mode of transferring to wood is described in another column, and we shall refer to the methods of transferring to paper or other surfaces in future articles. When the transferred collodion film is surface dry, but not de siccated, alcohol—methylated spirit will answer perfectly— is poured over it once or twice. This will absorb all the water, leaving the film saturated with the spirit, and on the application of a mixture of ether and methylated spirit the film will readily dissolve, and may be rinsed off without disturbing the image. It will be seen that the collodion film treated in this way remains, after the water has been absorbed by the spirit, in a spongy permeable condition, in which it is easily acted upon by solvents. The metallic image, whether of silver, gold, platinum, uranium, manganese, or other metal, modes of depositing which we shall describe fully hereafter, having been on the film in the form of metallic powder,
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