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The photographic news
- Bandzählung
- 13.1869
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- 1869
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- Bandzählung
- No. 560, May 28, 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. V66. XIII. No. 560.—May 28,1869. CONTENTS. PAGE Rendering Photographs Permanent by Parchmentizing the Paper 253 The Use of India-rubber in Phetography 254 Exhibition of Photography, Nature-printing, and Chromo- lithography, in Groningen 254 India-rubber for Mounting. By John Spiller, F.C.S 255 Manipulations in Photo-chemistry. By James RIartin 255 The Photographic Plane-table 256 Abnormal Light Effects Observed in Positive Pictures around Dark Objects. By Ludwig Schrank 25T ran a Photographic Experiments. By II. J. Newton 258 A Simple Developing Stand 260 The Alkaline Bichromates : their Solubility, Density of their Solutions, and Means of Distinguishing Them. By M. A. Davanne 260 Pecent Patents 261 Correspondence—Non-actinic Light for Operating Rooms—Wet Collodion in the Field without a Tent- Whiting’s Photo- Camera-Lucida 262 Talk in the Studio — 263 To Correspondents 264 RENDERING PHOTOGRAPHS PERMANENT BY PARCHMENTIZING THE PAPER. Is the course of a lecture at the Royal Institution twelve years ago, on the method of producing parchment paper, by the Rev. J. Barlow, he exhibited some photographs which had been printed on paper treated in the manner described, the result being, as it was stated, that it was possible “to obtain beautifully rich tones with a far less expenditure of nitrate of silver than at present.” Mr. Crookes, then Editor of the Society’s Journal, upon this hint, resolved to try the effect of the parchmentizing treatment upon various photo graphs selected as examples of different tones of p.inting, produced on various kinds of paper. The result was one lie had certainly not anticipated. “ The tint of the picture, even in the most delicate half-tones remained perfectly in tact, while the powerful yet uniform contraction of the added considerably to the sharpness ; the paper was, is, suddenly gifted with such great strength, that not only would it bear the roughest handling during the wash ing operation without even the possibility of tearing it, but at any after time, when finished and mounted, it would bear hard rubbing with soap and water and a wet cloth with out the slightest roughening or abrasion of the surface.” Besides these physical changes, the surface of plain paper prints assumed a peculiar glossy appearance, giving great richness and finish without vulgar gloss. The question of increased permanency only admitted at the time of conjecture, but Mr. Crookes expressed a conviction that a gain in stability would be obtaiued. A powerful odour of hydrosulphuric acid was emitted by the prints under treatment, and in the short time which elapsed between the experiments and the report no indication of fading or change was noticed. This much was the result of experiments published twelve years ago. At the time, we believe, the experiments were repeated by a few persons, but we do not remember any further published records. In a few experiments we made at the time wo verified the results described, and found but one disadvantage attending the operation, but in our hands it was a troublesome one : the parchmentized prints, when dried, had a rough, crumpled appearance, and the paper having become horny and harsh, it was exceedingly difficult to remove this crumpled effect without very heavy rolling, au operation which at that time was less common and less convenient than it is in our day, a good rolling-press not being then, as it is now, considered as a necessary adjunct of every photographer's establishment. This difficulty would probably be now of little weight, as, if the prints were mounted before perfect desiccation, and then passed through the rolling-press, all unsightly appearance would be removed. The twelve years which have elapsed have afforded sufficient time for a tolerably complete test of the value of the operation in conferring permanency, and an examina tion of the proofs affords the strongest corroboration of the original idea that permanency would be secured by the treatment in question. The prints treated in the original experiments of Mr. Crookes, and some by Mr. Spiller, have been preserved. The mode of testing consisted in dividing the print, and treating one-half with sulphuric acid, whilst the other half was left in its original condition. These two halves were then mounted side by side, and put away for future observation. On examining the prints after the lapse of twelve years the result admits of no doubt. The untreated half exhibits the usual sickly indications of change common to prints of that period, whilst the parch mentized prints present the pristine bloom of a recently produced print, no change of any kind being perceptible in their appearance. That this is most impoi tant there cannot be a question ; for whilst we believe that carbon or other similar perma nent printing processes will prevail in the photography of the future, yet it is tolerably certain that silver printing processes have a tolerably long tenure of existence before they are entirely superseded. If, then, some improved qualities and increased permanency can be secured by immersion in dilute sulphuric acid, it is, at least, worth further trial. One good result is tolerably certain : the operation will, in some degree, operate as a touchstone. A perfectly fixed and perfectly washed print will undergo no change of colour when treated with dilute sulphuric acid ; but if hyposulphite ot soda and silver be left in the print it will be decomposed, sulphur liberated, and the effects of sulphur toning will probably be at once exhibited. One thing must, of course, be borne in mind : the operation solely refers to plain paper prints. Albuminized paper prints are not suitable for the treatment in question, as the sulphuric acid partially destroys and seriously discolours the albumen Tor the benefit of those of our readers who may be desirous of experimenting in this direction, we append the instructions originally given by Mr. Crookes for parchmentizing prints. We may premise, however, that in some recent experiments by Mr. Spiller the use of a weaker acid has been found desirable, as assisting in closing the pores or parchmentizing the paper, and producing less of the crumpling effect to which wo have referred. He says an acid of 10 or 12 per cent, improves the appearance of the print, and effectually removes any trace of hyposulphite of soda which may have remained after washing. Mr. Crookes says :— Tako a good sound stoneware jug, holding about a pint, and stand this in the centre of a large pan. Measure out 8 fluid ouuces of sulphuric acid of the above strength (oil of vitriol of commerce will generally be found sufliciently strong to bo used), and pour it into the jug; then measure 4 ounces of water, and pour that into the sulphuric acid—not hurriedly, but taking about ten seconds for the
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