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The photographic news
- Bandzählung
- 13.1869
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- 1869
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- Bandzählung
- No. 559, May 21, 1869
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Zeitschrift
The photographic news
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Band 13.1869
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- Register Index To Volume XIII 629
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Band 13.1869
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THE PHOTOGRAPHIC NEWS. Vos. XIII. No. 559.—May 21, 1869. CONTENTS. Tins: Prevention of Cracked Films 241 Copyright in Photographic Portraits, and Ownership of the Negative 242 Parchmentized Prints and Permanency 243 A Brief Career for Permanent Photographs 243 Indian Photographs 244 Foreign Miscellanea 244 Photographic Printing in Silver. By W. T. Bovey... 245 On Retouching the Negative. By Johannes Grasshof. 243 PAGK On a Greatly Simplified Process of Printing in Carbon or other Permanent Pigment. By J. R. Johnson 247 Photography in India. By Capt. E. D. Lyon 249 Correspondence—Wet Photography with and without a Tent- Field Work without a Tent-Cracked Negative Films 249 Proceedings of Societies—South London Photographic Society 250 Talk in the Studio 251 To Correspondents 252 Photographs Registered 262 PREVENTION OF CRACKED FILMS. There are a few facts in connection with the subject of cracked negative films which, notwithstanding the fullness and frequency with which the subject has been discussed, deserve restating. There was a singular unanimity of accord in the discus sion at the last meeting of the Photographic Society, in regarding moisture as the chief cause of the cracking, and in approving of the storing of negatives in paper instead ot keeping them in plate-boxes. The suggestion of Mr. Frank Eliot as to the use of paper rendered waterproof is mani festly of vital importance, therefore, in securing safety. To endorse that suggestion, and give it an immediate practical value, Mr. Russell Sedgfield writes, stating his own practice, and enclosing a sample of the waterproof paper he uses. He says:— “Dear Sir,—Wi h reference to the discussion at the last meeting of the Photographic Society, I enclose a sample of the paper which I use for packing and storing negatives. It is known as pitch paper, is used for packing goods which might be injured by damp, and may probably be obtained at most of the large stationers; price, about six shillings per quire; size, double imperial (45 by 29 inches). “ Besides packing negatives to put away, I use it for albu- minized paper, prints, slides, &c., for export. For a moderate voyage it is probably quite sufficient, without going to the expense of tin-lined caser.—Yours truly, Russell SEDGFIELD. “1, Park Hoad, Norbiton, Kingston-on-Thames, May 15.’’ The sample enclosed is a strong brown paper, coated on one side with pitch or black paint, rendering it quite water proof, and no bad substitute, for many purposes, for American leather cloth. It is to be obtained, probably, as Mr. Sedgfield states, from most large stationers, and, if not, as soon as the demand for it exists, it will, doubtless, be kept by photographic dealers. It serves admirably to pack photographs for travelling, and preserve them from damp, a point of importance which does not always receive as much attention amongst English photographeis as it deserves. We occasionally receive pictures which are well packed in every respect except being waterproof, and which, having been exposed to rain, are spoiled with damp. We occasionally receive parcels of photographs from Germany which are invariably packed in this pitch paper, and this, with a wooden board or box, forms a perfect protection. To return, however, to the protection of negatives. We have a suggestion to make in regard to this waterproof paper which may be worth attention. We recommend that bags of this paper should be made of suitable size, with a flap to wrap over when the negative is placed therein. Each negative should be first wrapped in clean, dry blot ting-paper or smooth writing-paper, and a few negatives so wrapped up might be placed in each waterproof bag. In the case of negatives rarely used, the flap might be sealed down with thick india-rubber cement, which could, when required, be raised, by using care, without tearing the paper, which is very tough. For bags containing negatives in frequent use an india-rubber band might be used, which could be placed over the flap, which would be thus pressed very tightly down, and made almost impeivious to moisture. It is probable that it would remunerate some photographic dealer to make such bags ready for use in order to supply to photographers. Another fact in connection with the subject should not be lost sight of. There are two distinct kinds of cracks to which negative films arc subject, and which—although pro bably both arising from damp as the proximate cause— have nevertheless a different remote origin. Ono kind is most aptly designated as the honeycomb cracking, and the other as the vermicular cracking, the former sometimes issuing in the latter. The negatives exhibited by Mrs. Cameron at the Photographic Society’s meeting, although described as affected by the honeycomb cracking, were really well-marked instances of the vermicular cracking. In the first-mentioned form of cracking, the film really pre sents a series of honeycomb-like cells with well-defined ridges, which, unless especial care be taken to prevent such a result, eventually become a series of cracks of the form of the ridges. This form of defect may, if taken in time, be remedied, in the manner already described in our pages, by means of the vapour of alcohol; or, in some instances, by flooding with warm alcohol. The second form of cracking, to which the term vermicular has been applied, presents no ridges at all. It consists of a series of fine irregular cracks —as fine as a hair sometimes—taking the form of slug tracks, sometimes more resembling the honeycomb mark ings, but so fine that it is barely possible to see any fissure on the surface of the varnish, and suggesting, at first sight, the idea that the collodion film has cracked, under the var nish, an idea generally erroneous, as was proved by Mr. Blanchard at the meeting in reference to Mrs. Cameron’s negatives, inasmuch as the cracks, visible enough by trans mitted light, although scarcely perceptible by reflected light, were filled up and rendered invisible altogether by rubbing a little soot over the surface. The honeycomb crack is unquestionably due to moisture, and is, we believe, invariably due to the presence of hygro metric salts left in the film, as we have recently described. The exact origin of the vermicular crack is less certain, although there is little doubt that moisture and changes in temperature are active agents in bringing about the final result. But, whilst we believe that the varnish has little or nothing to do with the honeycomb crack, we are inclined to
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