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The photographic news
- Bandzählung
- 7.1863
- Erscheinungsdatum
- 1863
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- Englisch
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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. 245, May 15, 1863
- Digitalisat
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Zeitschrift
The photographic news
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Band 7.1863
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- Register Index 619
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Band
Band 7.1863
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230 THE PHOTOGRAPHIC NEWS. [May 15, 1863. The collodions I employed in my experiments were all, with one exception, bromo-iodized. As I am more partial to the use of iron as a developer than to pyrogallic acid, I determined to use the former for my experiments. I made a solution of pure sulphate of iron, 20 grains to the ounce, and added thereto varying quantities of acetic and formic acids. (The'former glacial and the latter of the pharmacopal strength.) The propor tions that I found to answer best were 10 minims of acetic and 15 minims of formic acid to the ounce of developer. The results showed that with the above quantities the ex posure was reduced to one-third (from fifteen to five seconds, for instance). The negatives developed exceedingly clean, without the least trace of any deposit on the shadows ; but were all very much wanting in intensity, the image being thin and grey. I could only intensify it in the following manner: after fixing, wash well. If the collodion be at all likely to slip, the plate should be dried, the edges varnished, and it should then be soaked for some minutes in warm water. Have ready a filtered 2-grain solution of bi-chloride of mercury. Cover the negative with a good quantity of it, or, better still, immerse the plate in a dish full of the solution. Carefully watch it, and as soon as the dark tint which it at first assumes begins to turn lighter, rapidly wash it. Now immerse it in a very weak solution of iodine in iodide of potassium or of ammonium, about 1 grain in 5 ounces of water. Should stains occur under the after treatment these two solution have most likely been too strong. The remedy is simple,—use them weaker. Do not let the plate remain long in the iodide solution ; no visible change will take place. After again washing it may be exposed for an instant to diffused daylight. All the operations must be performed in the dark room, as the result is then much more under control. The negative is now to be re-developed with pyro and silver in the usual way. The image will then be found to be of a deep orange tint, and very delicate; the particles of silver composing it appearing to bo very fine. If citric acid, in place of acetic, be added freely to the pyro solution, the image will be of a splendid purple, but, of course, is not so non-actinic as the orange tint. I have not yet tried formic acid with the double sulphate of iron and ammonia, but recommend it to the attention of those whose object is to secure instantaneous results. 5, Aberdeen Park. ENAMELLED PHOTOGRAPHIC PAPER. BY L. M. LIESII. As enamelled paper is now attracting attention, it may be of service to those interested in the matter to know that the same paper may be had in London, equal, if not superior, to any I have seen by the German makers. Some four years ago I experimented largely upon various enamelled papers, with the view of applying them to photographic printing— a short description of my experience in this direction may be interesting and useful to your readers, who may wish to experiment in a similar direction. My object in making these experiments was two-fold, viz.: to get rid of the grain of the paper, and of the brown tone usual in albumenized prints. After trying various enamels I found that the oxide of zinc was the only one answering the purpose. I applied to Messrs. De la Rue and Co., Bunhill Row, London, to prepare a quantity of paper and cards enamelled with the pure oxide of zinc. The greater portion of this paper was prepared with two coats of zinc white, some had three coats; and some only one coat; the cards had three coats, a portion of the paper had ten grains of chloride of sodium to the ounce of enamel. This I used to float on a new bath; after a sheet or so had been floated, the plain unsalted gave the best results. The paper was floated one minute on a GO-grain nitrate bath, and was dried and exposed under the negative in the usual way. It printed in about half the time of albumenized paper, of a blue-black tone, which did not alter in the toning and fixing bath of hypo and gold I then used. The details of the negative were rendered in the most exquisite manner, and when removed from the fixing bath nothing could be more beautiful. The drawbacks of the paper were that the prints were apt to become injured in the subsequent washing, and even after they were mounted they were easily scratched. I tried coating the enamelled paper with albumen, but the tone was not so good. As a whole I obtained the best results with the enamelled cards; those had three coats of enamel, which gave a beautiful surface. These cards were floated on the silver bath in the usual manner, and printed upon, with a mask of thin black paper put round the outside of the negative to confine the image within proper bounds and leave the necessary white margin round the card. This saved the trouble of mounting, and obviated any fear of cracking, as the cards remained quite flat, and the finished card presented a neater appearance than if the picture had been mounted on it. I may here remark that the paper prepared for me by be la Rue and Co. was not liable to crack. It was beautifully finished, and if my memory serves me right, the price of the two-coat enamel was about £2 10s. or £3 per ream, demy. They would not make me a smaller quantity to order; but, I dare say, now it may be had in smaller quan tities. I had also some prepared by another London house, with certain modifications, such as introducing salt, &c., &c., but I did not obtain any advantage; the enamelling was not quite so well done as that by De la Rue. The above experiments may induce some of your readers who may have more time, to devote their attention to the subject; and if it does no other good, it will tend to remote the monopoly or secresy that at present exists respecting the enamel paper. Grange Road, Darlington. LANDSCAPE AND INSTANTANEOUS PHOTO GRAPHY. BY W. U. WARNER. It may prove interestimg to some of your readers to know of a formula which at all times will gives atisfactory results whether employed as an instantaneous process or otherwise. It is one that I have used for every kind of work during the last eighteen months ; it is certain, sure, and safe ; it keeps well, and, above all, it is economical. To many of the veterans in photography it is probably well known already, but it is for the benefit of those gentlemen who have only occasional opportunities of practising our beautiful art, but who, nevertheless, appreciate a good negative, and are all the more pleased when they get one, I address myself. Collodion. Ponting’s plain iodized ... 5 oz. Perry’s (new) bromo-iodized ... ... lOoz. mixed, it will keep any length of time, and works equally well at seven years old as it does at one month. Bath. Any good commercial sample of nitrate of silver 40 grains to the oz. made according to Lake Price’s formula. Developer. . Proto-sulphate of iron ... 30 grs. Water ... ... ... ... ... 1 oz. Glacial acetic acid, crystallizable at 50° 30 mins. Nitric acid 1 min. to every 4 oz. of solution. Alcohol ... ... ... ... quantum stiff. When the subject is well out, wash thorouyhly. The nitric acid makes the film close and tough; it never reticulates in the hottest weather.
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