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The photographic news
- Bandzählung
- 12.1868
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- 1868
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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. 512, June 26, 1868
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Zeitschrift
The photographic news
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Band
Band 12.1868
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- Titelblatt Titelblatt I
- Kapitel Preface III
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- Register The Index To Volume XII 619
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302 THE PHOTOGRAPHIC NEWS. [June 26, 1868. inert it would do little harm. The remedy, then, consists of covering over with an inert substance the surface from which we cannot remove the actinic substance. A little pure bees’-wax dissolved in ether and rubbed over the plate has the happy effect of coating the surface with an almost imperceptible film, which is quite inert in itself to photogra phic action, and effectually interposes a barrier between the collodion film and the chemicals it contains, and the glass surface and the active dirt which rests unseen upon or in combination with it. Whilst no photographer will wil lingly work with dirty glasses, he possesses in this coating of wax a relief from the immediate annoyance of bad plates when perfect ones are not immediately procurable. COLLODIO-CHLORIDE FOR PRINTING ON IVORY. The enquiries of several recent correspondents as to a simple method of printing on ivory have induced us to repeat some experiments with our collodio-chloride of silver process for that purpose. Mr. Fry published in our pages, a few years ago, a method of silver printing on ivory, excellent in result, but somewhat troublesome in detail. We also published, some years ago, a method of securing good results by means of the Wothlytype process. But after some experi ment in this direction we arrived at the conviction that there is no method of printing upon ivory by which such good results can be obtained with so much ease and certainty as by the collodio-chloride of silver process. No modification of the formula is required : a sample of collodio-chloride which works well on paper or opal glass will give admirable pictures on ivory. One condition only is of importance : to secure the best results the collodion should not be made of a sample of pyroxyline giving a very horny, repellent film. The sample we have used is such as we should choose for a negative collodion, neither very powdery nor very horny. It adheres perfectly to ivory, giving a hard surface, less easily scratched or abraded than the same film on glass, and the appearance of the image does not differ perceptibly from one on the surface of the ivory itself without collodion intervening. The prepared ivory is coated with collodio-chloride, and when dry is printed, toned, and fixed in the same manner as a picture on opal glass. The film adheres with sufficient tenacity to render any edging of varnish unnecessary. A more perfect washing to remove the hyposulphite is neces sary than with opal glass, because of the more absorbent character of the ivory. A somewhat unexpected fact may be here noted, which may prove of service to some of your readers who may have in hand the materials for collodio-chloride of silver appa rently spoiled. About twelve months ago we received from a correspondent two bottles containing the unmixed collodio- chloride as supplied by a manufacturer, one bottle con taining collodion with nitrate of silver in solution, and the other containing collodion with a chloride in solution ; the labels instructing that the contents should be mixed in equal parts to form the collodio-chloride. Unfortunately, collodion containing nitrate of silver is subject to decompo sition, and that forwarded to us had, after a few months’ keeping, turned quite brown, and our correspondent wished to know if it were fit to be used. At the time we condemned it as useless; but, a few weeks ago, in the course of some experiments, we were induced to try the mixture of the con tents of two bottles. The result was, of course, a discoloured sample of collodio-chloride of silver; but what was our sur prize on examining it again, after it had stood a few hours in the dark, to find that the dark-coloured collodio-chloride had become perfectly milk white ! The chlorine liberated in the decomposition had acted on the decomposed, darkened salt of silver, converting it into pure white chloride of silver. This fact may prove as useful to those of our correspondents who have a decomposed sample of the nitrated collodion on hand as it is curious and interesting,’ In our next we shall detail the results of some experi ments with the paper prepared with collodio-chloride of silver manufactured commercially by Herr Obernetter, which is used considerably, we understand, in Germany. PERMANENT ALBUMINIZED PRINTS. Our attention was called a few days ago to some examples of unusual permanence in albuminized prints. Those in question had been printed six years, a period not unusual, of course, for photographs to remain without fading, but, nevertheless, a period at the expiration of which most silver prints have generally lost their first bloom, that especial purity of the whites and rich velvet-like depth in the blacks which are the glories of fine silver prints. The prints in question were printed on a distinct sample of paper, and could each be readily picked out from a number of others printed at the same time on other samples of paper, the distinction being found in the fact that whilst the other prints, without being absolutely faded, had all lost their first freshness and beauty, and were less brilliant in the whites and less rich in the blacks than at first, these seemed wholly unchanged. As all had received the same treatment and were printed at the same time, it became worth while to enquire to what the difference was due. The only difference consisted in the fact that the per manent prints were printed on a sample of albuminized paper prepared in Germany, which was popular a few years ago, and the use of which at the time we were strongly tempted to condemn as, d priori, likely to yield unstable prints. It was manifestly prepared with albumen which had undergone decomposition, and the smell was most offen sive. Two questions arise as to this source of permanence: Is it possible, however unlikely, that the use of the decom posed albumen could in any way conduce to increased per manency? or is it more probable that the permanency is due to the special quality of the sample of paper upon which the decomposed albumen rested? The paper was exceedingly thin; so much so that until the prints were mounted on a good white board they looked poor and want ing in brilliancy ; and if mounted on a tinted board the whites were somewhat degraded by the tint showing through. The thinner the paper the more easily it is permeated by the fixing and other solutions, and the more easily perfect washing is effected. Possibly, therefore, the extreme thin ness of the paper was an element in the stability of the prints. The subject is certainly worth examination; and, at Mr. Blanchard’s suggestion, we bring it before our readers, to permit the comparison of notes on the subject. Possibly other photographers may be able to examine prints produced on the same paper, which was at the time somewhat exten sively used. It will be interesting to learn if the experi ence of Mr. Blanchard in this matter is confirmed by that of other photographers. KEEPING AND DATING COLLODION. The advantages of ripe collodion, and the troubles contin gent upon the use of samples newly mixed, are too well known amongst photographers to require enforcing. It is not a little singular, however, that it is at times difficult to procure a sample sufficiently ripe to work with desirable vigour and brilliancy. A correspondent recently called our attention to this fact as a ground of complaint against manufacturers of collodion. Having just received a parcel from a first-class manufacturer, whose collodion he had used some time with advantage, he found in the new sample none of the qualities of the old. It gave a thin image, which did not readily intensify, had a tendency to fog, with other concomitant defects of newly-mixed collodion. On com plaining to the manufacturer of these defects, he received the somewhat facetious reply that it would work capitally | in the course of a couple of years.
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