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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
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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. 191, May 2, 1862
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 6.1862
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- Ausgabe Ausgabe 73
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- Register Index 619
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Band
Band 6.1862
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2, 1861 r soft va itized f ffect. 6 late frol mayW' r a mib‘ tile war” , and d per, to ° ains 11 mces e. Ap setter 15 ular 9 ’our or’ t. enougb. Then ■id. wit red pio s of an r ng out’ ns of p ne, thu. vater n ate ofs ■r, disa cyani" d skie V /ith all, et collo/ tials0‘ it givl5 ieing ing, fi it to b‘ quite i 1 can ared P re not 11 ormed " i sea?” usions A s a siw/N re mI there V inep™, ourag‘ sriencel .and " onde»7 ; pen.’ and” turbed) at, afts beari icapes V priuti 4 on ta4 ion, "e'i . mo"f there< MAY 2, 1862.] THE PHOTOGRAPHIC NEWS. This morning, as a last resource, I prepared the solution so strongly recommended by Mr. Brothers, of Manchester, Puoro- GAPltic News, vol. v. p. 167, by dissolving 30 grains of mer- Ctry and 30 grains of chloride of ammonium in 10 drachms "i water, and a second solution of 1 drachm of liquor ammonia ™10of water. On treating a plate with th special precautions in their preparation, nor complex solu tions required, it is in the power of all to succeed with them as easily as myself. If Mr. Sutton has tried the formula:, I cannot imagine how such an expert chemist and photo grapher failed ; if he has not done so, and states his opinion from theory, I hope he will do me the justice of testing them. 1 am sir, yours respectfully, William Bartholomew. [The most sensitive dry plates known commercially, are those of Dr. Hill Norris, described as extra sensitive, and these he states to have no free nitrate. Ev.] INTENSIFYING DRY PLATES. Sib,—Can you or any of your readers supply me with a good formula for intensifying dry plates ? I find that the several strengthening solutions recommended for plates by the wet process, will not all answer for the dry, and that the attempt to gain intensity by their use has lost me several negatives, which were good in all other respects. I find also that negatives obtained from Fothergill and malt plates require different intensifying agents to those prepared by other processes. At first I employed Mr. Blanchard's Method, by pouring over the wetted film a solution of 4 pains iodide potassium, and 2 grains iodine, to the ounce of water, and when the image was converted into yellow iodide, poured off, washed, and treated with citro-pyrogallic and silver. This last operation was wholly ineffective, as Ilie colour of the film remained unchanged. Several plates were treated in this way, and to test one of them, a saturated solution of hypo was poured on after redevelopment, when the film was immediately dissolved. In no one case have 1 found this method successful with dry plates. Having been compelled to abandon Mr. Blanchard's for mula, I adopted the one given by you at vol. iv. p. 13, and dissolved 20 grains of bi-chloride of mercury in an ounce of water, to which I added iodide of potassium until the red precipitate became dissolved. Half of this and half of water acted admirably upon plates prepared like Fothergill’s, with the exception that the albumen,coating was not washed off; and after treatment with citro-pyrogallic and silver, satisfied me in every respect. But with ordinary Fothergill plates, as with those by the malt process, I found myself no better off than with Mr. Blanchard's solution. The film became converted into yellow iodide, and resisted all subsequent attacks from the redeveloper. In one case, indeed, there was slight blackening, and in one stereo plate, part intensified Wlile the rest would not. When the image camo out as a Positive—as several of the plates did—I was in every in- Nesce obliged to abandon the attempt to intensify as hope- ,10 of water. On treating a plate with the former of these, the film did not assume “ a rich cream colour,” but blackened very unequally, without further change. At the end of one minute the solution was poured off, the film "ashed, and the ammonia solution applied, when the image at once vanished, leaving me to the unpleasant conviction that I had been completely “sold.” I should state that all the plates referred to were exposed, developed, and fixed last autumn, and that never having before obtained a negative from a dry plate that required intensifying, I have had no experience in the matter until within the last fortnight. The strengthening solutions I have mentioned may succeed well enough with their iron negatives by the wet process, but they seem to me to be un- S 'r C i to dry plates. I shall be glad to find that some more reliable means can be suggested than those which have Proyed.so.unsatisfactory in my hands, and that if 1 have cormittedanyserror " l the manipulation, you will kindly point it outY ours very respectfully, Amateur. [The fact that want of density or vigour is not a common characteristic of dry plates, has rendered unnecessary much attention to the best modes of intensifying them, and the conditions are consequently not well understood. It is quite certain that those processes of intensifying which are successful with wet plates, are by no means necessarily so with dry plates, the presence of organic matter in the latter materially modifying the result. The best mode of dealing with dry plates, which show tendency to thinness, is to con tinue the intensifying with pyro and silver whilst the plate is still wet after fixing. Any plate, by either wet or dry process, is difficult to intensify a few months after develop ment, irregular patches almost invariably occurring. If bichloride of mercury be used, it should be much weaker, and remain on the plate a shorter time than for wet plates, or the image will be actually weakened. If the solution of iodine, to be followed by pyro and silver be used, the result will be better if it be removed, and the plate well washed before the image has been coverted into the yellow iodide of silver ; on first applying the solution, the film assumes a dark greyish colour: wash the plate at this stage, and then use pyro and silver. It should be borne in mind that the application of hypo or cyanide to the plate at any stage after it has been treated with iodine is dangerous, as much of the image which consisted of reduced silver, having been again converted into iodide of silver, is easily soluble. Pos sibly sulphide of potassium would be found useful in inten sifying dry plates: it is much in use amongst American operators for wet plates, and it appears likely that it might be more applicable to dry plates than many intensifying agents. Perhaps, if any of our readers have had occasion to experiment in obtaining additional vigour in dry plates, they will give us the benefit of their experience.—Ed.] Aotograpbir Zlotes and QQueries. Removing Vaknish from Plates ; Mealiness, &c. Sir,—In the last number of the Photographic News, a correspondent wishes to know a method whereby he can clean glasses that have been varnished. I have always found that benzine will take the black varnish, and that for white spirit varnish, nothing is so good as pure, wood spirit (naphtha]. Some time since, having some varnished glasses, I tried many things to clean them ; amongst others, soaking them in strong alcohol, with no effect, until I tried the naphtha, and that answers admirably. I merely apply the spirit the same as though I was coating with collodion, and let it rest on the plate about half a minute, and then return it to the bottle, afterwards rubbing the plate with cotton wool; when the col lodion is all off, I wash in two or three waters. A great deal has been said and written about mealiness in toninrg. My strong impression is, that we must look to the albumenizing for the trouble; for let anyone now troubled with it prepare a sample of paper with albumen, simply using albu men, water, and chloride of ammonium, and sensitize upon a 60-grain silver bath, without the addition of acid or any other substance, and I am sure they would no longer meet with the difficulty; for I always prepared my own paper, until the rage for cartes de visite compelled mo to buy it, owing to not having the time to prepare my own, when I got mealiness in its worst form. I tried many samples, sometimes without and sometimes with it, always using the same silver bath (60 grains), and the same toning (carbonate of soda 5 grains, chloride of gold 1 grain, water 6 ounces). If I got a paper free from it, 1 could not get the tone I desired. I now use Marion’s Highly Albumenized, and am very well satisfied with it, although I would rather have my own prepa ration ; and even all of Marion’s is not good, for I have had some very bad. A sample of paper I obtained from one house smelt very strongly ot acetie acid ; this I could do nothing with; the pic tures were smothered with mealiness.—I am, sir, very respect fully yours, k April 24M, 1862.
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