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The photographic news
- Bandzählung
- 15.1871
- Erscheinungsdatum
- 1871
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- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 674, August 4, 1871
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Zeitschrift
The photographic news
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Band
Band 15.1871
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- Titelblatt Titelblatt I
- Sonstiges Preface III
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- Register Index 619
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Band
Band 15.1871
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THE PHOTOGRAPHIC NEWS. Vor. XV. No. 674.— August 4, 1871. CONTENTS. FADE Col. Stuart Wortley’s Collodio-Bromide Plates 361 A Simple Mode of Reproducing Negatives 361 Varnish for Retouched Negatives 362 Photography at the International Exhibition 362 Foreign Miscellanea 363 American Correspondence 364 Photography in the North of Europe. From Our Own Corres pondent 365 Practical Hints for Young Photographers. By Lieut. Abney, R.E., 366 rAGE How to Prepare Durable Sensitive Albumenized Paper without Washing or Fuming. By L. G. Kleffel 367 Note on the Retouching and Etching of Negatives. By R. Eich 367 The Asphalte Photo-lithographic Process. By Ludwig Schrank 368 A Little Talk about Photography. By John L. 369 Correspondence.— Photographing Children—Cards at Ono Shil ¬ ling and Sixpence per Dozen 370 Talk in the Studio 371 To Correspondents 372 Photograph Registered 372 COL. STUART WORTLEY’S COLLODIO-BROMIDE PLATES. We have within the last few days exposed and experi mented with some of the collodio-bromide plates prepared by Col. Stuart Wortley, which he was good enough to submit to us for testing purposes. The plates in all respects justified the impression we have already recorded. As we, as a rule, prefer full exposures, we gave the first plate about double the time we should have given to a wet plate under similar circumstances, which was still under a minute, the light being good. To our surprise, the negative was considerably over-exposed, a phantom image quickly appearing under the application of the pyrogallic solution alone. This, we remark in passing, which is regarded as a desirable if not a necessary con dition with some dry plates, is regarded as by no means important by Col. Stuart Wortley in working these plates with his method of development. We have seen plates, in his hands, which showed no trace of an image whatever after remaining some time covered with the plain pyro solution, start rapidly into developing action on applying the ammonia, detail in abundance, and satisfactory vigour, being quickly obtained. The soaking action of the alcoholic Pyro solution, although producing no visible result, has a very specific value in aiding the rapid development after the application of ammonia. In our case, where a thin image quickly appeared on applying pyrogallic acid, we regarded it as indicative of over-exposure. The bromide and ammonia were at once added, and a good negative, very soft, and full of detail, was obtained almost as rapidly as a wet plate could have been developed. The next plate received an exposure as nearly as possible the same, by estimation, as wet collodion would have received, and yielded a fine negative. In development we adopted precisely the course followed by Col.. Wortley, as described in our last issue, and find it just as simple and satisfactory in our own hands as it manifestly was in his hands in the various experiments we have seen in his studio. With reasonable care there appears to be no possible risk of failure or difficulty. The plates develop with a remarkable evenness and freedom from stains or irregularities of any kind, and intensify, when necessary, easily and satisfactorily after fixation, on application of a slight dose of acid pyrogallic solution and silver. The deposit is of the fine non-actinic greenish smoky tint we have before described, singularly fine and free from granularity or crystalline character, which photographers so well know as yielding harmonious and rich prints. In referring to relative exposure some difficulty neces sarily occurs in precision of statement. We have not stated the number of seconds, because such a statement means little or nothing unless all the other conditions of lens, light, and subject could be accurately stated. Suppose we say the exposure was thirty seconds, with a triple lens of seven inches focus and three-quarter inch stop, moderately good light, foliage partly in sun and partly in shade. This may convey some idea to some readers ; but at best it is far from precise, as “ good light” is a very variable thing under the best circum stances, and during the recent changeful weather it has been variable beyond statement. The report that the exposure bears such and such a relation to that of wet collodion is more nearly precise, for although different samples of wet collodion worked under different condi tions vary somewhat, the statement affords some approxi mate idea. The collodions of various commercial makers worked in reasonably good conditions of ripeness, of nitrate bath, and of developer by the majority of por traitists supply a standard sufficiently definite to enable photographers to speak of relative exposure without much ambiguity, and hence we think that it is a better mode of estimating the sensitiveness of dry plates to state their relation to such a standard than the plan occasionally adopted of mentioning an exposure of a certain number of seconds with all the precision possible in relation to lens, light, and subject. A SIMPLE MODE OF REPRODUCING NEGATIVES. In the course of our recent experiments with collodio- bromide. plates we have hit upon a very simple method of reproducing negatives, which, so far as we can judge at present, promises very specific practical value. A collodio- bromide plate, having been exposed a few seconds under a negative to a dull diffused light, was developed by alkaline solutions in the manner above described, and yielded a very fine transparency. After well washing, it was flooded with nitric acid, which rapidly dissolved all the reduced silver, and left a negative image of bromide of silver. This was thoroughly washed, taken into the light, and intensified with pyrogallic acid solution and silver, and then fixed. The principle upon which this operation is based is not unfamiliar to our readers, although this application is, we believe, new. The image produced by means of alkaline development upon a collodio-bromide plate is formed entirely from the bromide of silver in the film, which is reduced by the joint aid of light and the developing agent to the state of metallic silver. This metallic silver- is, of course, soluble in nitric acid, and when the developed image is treated with nitric acid, all the reduced silver is at once dissolved, leaving a reverse image in bromide of silver, which is insoluble in nitric acid. The experiment
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