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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
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- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- http://digital.slub-dresden.de/id1780948042-18620000
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- Bandzählung
- No. 211, September 19, 1862
- Digitalisat
- SLUB Dresden
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Zeitschrift
The photographic news
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Band 6.1862
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- Register Index 619
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Band 6.1862
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act— icipal y by tints nites- which rgra- nicest is. 1, and nding e and ap, or light of ac- keeps vishes, action ; never e, this whole- about ae fact es are racter, igger; copied ra and It, and —their •bother r than a car- nen of itres of ve put rith no if well eries- ley are ilumns, acture, st, and ne and edge- ty that araight, ate. s not 11 e inanf d, if in but, <* vad and lives i the* sing $0 he per i build- gravins im, and 3 works ■lion o' cutting lost cut present, orate if rations, and if nifestly I am, . T. 449 THE PHOTOGRAPHIC NEWS. September 19, 18G2.J PRINTING WITH THE SALTS OF URANIUM. PaixrxG and toning with the salts of uranium are in their infancy. Notwithstanding this, it is certainly an attested fact, that vigorous prints can be obtained by these salts; and that the ordinary toning with chloride of gold is modified, perhaps improved, by the introduction of the same salts; and yet photographers do not like any innova tions, and frequently, on this account, allow very powerful reagents, and their successful applications, to pass by un noticed. The following methods of printing with nitrate of uranium have already appeared at different times in the photographic journals; it will do no harm, however, to pre- ient them altogether. We translate them from the “ Photo- I graphischer Almanach ” for 1862, a very interesting practical | little work, a valuable vade mecum for the amateur and pho- ! tographer, published by the Institute at Elberfeld ; unfortu- I nately its value is limited to those who cither speak -or i understand the language of the Teutons. We intend to cull from its contents, and from the contents of all available sources in any language, the sweets of photographic lore, for the benefit of our readers; nor do we deem it illegitimate to take the step, since we are willing and desirous that we should be served in the same way ; nay More, we will labour hard to discover and collect together whatever may be useful in the art of photography, or instructive in its science, in order that our fraternal journalists may not task us with meanness, but may meet with an adequate indemnification for our stealth from their columns. Our readers can assist us materially, by their erperience, to make the collection just referred to; and we hope to find several of our friends awakening up from their lethargic inactivity, and, if they do not feel inclined, have not the time, or the chemical knowledge to enter into a eourseof independent photographic experiments, let them, at least, try to test the experiments of others and report 'Sults. Developer. 1000 grains of distilled water, 1 grain of chloride of gold ; J of a drop* of hydrochloric acid. The picture must lie in the bath as long again as in that containing nitrate of silver ; the tones become blue or blue black, and the middle tones are easily attacked by the bath. Fourth Method. Developing with a salt of mercury ; 2000 grains of distilled water ; 1 grain bichloride of mercury (corrosive sublimate). The image will be perfectly developed in two or three minutes in this bath. The tone by this developer is the most beautiful and vigorous. As soon as the prints are thoroughly developed, they are washed in water for fifteen or twenty minutes, and then dried. Parrrxa PaocESS or HouDor. The paper is floated in a lukewarm solution of five parts of gelatine in one hundred parts of water, and after this for ten minutes in a bath of nitrate of uranium—20 per cent, strong. It is then dried in the dark. It is afterwards ex posed beneath the negative for one to ten minutes to the direct rays of the sun. The print is developed by immersion in the silver bath, and, as soon as the image has appeared with sufficient vigour, it is placed in the following solu tion :— 1000 grains of water; 80 „ sulphate of the protoxide of iron ; 20 „ acetic acid. The picture quickly assumes great vigour of a sepia tone; it is then instantly well washed in water and toned in a bath of chloride of gold one grain, and water 100 grains. By this means the picture is retained quite on the surface of the paper.—Humphrey's Journal. Parxrrsa PROCESS with Nitrate of Uranium. By H. de la Blanchere. First Method. Take 10 drachms of distilled water; „ 2 drachms of the nitrate of the oxide of uranium. Filter the solution and preserve it in the dark. The paper lust be floated for five minutes in this bath. When dry, it M exposed under a negative in the printing frame, for a time 'drying from one to ten minutes in the direct rays of the sun, and from fifteen to sixty minutes in the shade. The picture is developed by immersion in the following Bolution : 10 grains of nitrate of silver, crystallized and slightly acid. 10 drachms of distilled water. The picture appears in about thirty seconds, and becomes more vigorous; as soon as it is sufficiently developed, it "ust be washed in several waters, and then fixed. It may “fterwards be toned with gold in the usual way. Second Method. The sensitizing bath is the same as the preceding. As 'on as the paper has been exposed to the light, it is im- ersed in the following bath. 10 drachms of distilled water ; 1 drachmsof alcohol, specific gravity, *849; 5 grains of nitrate of silver ; 13 „ of nitrate of cadmium ; 13 „ of nitrate of uranium ; Th i a drop* of nitric acid. e bath must be very slightly acid. m. Third Method. -he sensitizing bath as before. a teOne fourth of a Crop of nitric acid 13 obtained as follows — Drop into thigsolltionresuarops of water and one drop of nitric acid. One drop of will be equivalent to one fourth of a drop of nitric acid. A SHORT LESSON IN CHEMISTRY.—No. 3* Before I proceed any further in reference to chemical nomenclature, I deem it necessary hero to describe what is ment by acids, alkalies, and bases. As the word implies, an acid is sour; to taste chemicals, however, is a very in convenient method of testing them, and one that is seldom to be recommended ; hence we have recourse to other dis tinguishing characteristics. In short, the distinct properties of an acid are as follows ; in the first place it has a sour taste; secondly, it turns blue litmust paper red; thirdly, it com bines with bases so as to form new compounds in which neither acid nor base can be recognized, unless they are again separated. An alkali is a substance whose taste resembles that of urine (of course you will certainly verify this test) ; secondly, it restores red litmus paper back to its original blue; thirdly, it turns yellow turmeric^ paper brown, or red-cabbage2 paper green ; and finally, it combines with acids so as to neutralize them or remove their acidity. All alkalies are bases; but not all bases are alkalies. Bases are substances, either simple or compound, that neutralize acids and form with them a class of bodies totally different both from the acids and bases; the bodies thus resulting from the chemical combination of acids and bases * From Humphrey’s Journal. t Litmus is a dye-stuff, prepared from a lichen called Roccella tinctoria. It is sold in the form of cakes or squares of a violet colour. To prepare tho ble paper, take one part litmus and four of water, mix or dissolve, and brush the solution over unsized white paper. Dry the solutions and keep them in close vessels in the dark. Red litmus is prepared from the blue by immersing the sheets in dilute sulphuric acid or vinegar, and then drying, &c., as with the blue. t Turmeric is a root (Curcuma louga) which yields a dye-stuff to alcohol as tincture, or by decoction to water. For these purposes take one part of the pulverized or rasped turmeric to five parts of ordinary alcohol in one case, and one of turmeric to ten of water in the second. The unsized sheets of white paper are immersed in either of these fluids and afterwards dried. ? Cabbage paper is prepared by steeping white unsized paper in the infu sion of red cabbage, and afterwards drying.
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