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The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
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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. 1392, May 8, 1885
- Digitalisat
- SLUB Dresden
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- Parlamentsperiode
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Zeitschrift
The photographic news
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Band
Band 29.1885
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- Register Index III
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Band
Band 29.1885
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regarding the formation of the sensitive molecules at the shown of forming the organic salt has its advantages over crystal, such as the commercial article usually appears. To make the plain chloride emulsion, we take :— Dissolve with gentle heat as before ; then add:— toning bath; moreover, if the toning be followed by Silver nitrate ... Distilled water Gelatine Distilled water Bicarbonate of soda Water described. When an emulsion is of such a character that the action of light produces a red image, then fuming Gelatine... Ammonium chloride Distilled water ... Liq. am. fort -880 Citric acid 3 grammes 30 c.c. 3 grammes ■64 „ 33 c.c. 2 grammes 5 c.c. 10 grammes 1,000 dealing with plain acid chloride emulsion we prefer to employ the thiocyanate of gold toning method, follow- modifies the colour somewhat, and a bluer image is the result; the finished print, however, has not gained any- salt. Ammonium thiocyanate is of itself a fixing agent, albeit a slow one, and when used in conjunction with gold, aware, and it was long ago observed by druggists in the preparation of cold cream and other similar substances; although its application in the present instance may be novel, it is none the less worthy of attention, and before closing this series of articles we shall be in a position to speak with greater certainty upon the subject. Glass, opal plates, and similar surfaces prepared with a compound emulsion in which silver tartrate is present to any extent, exhibits considerable roughness when dry, irrespective of the manner such combination is brought about. Washing the emulsion for a considerable time does not remove this tendency, while it seriously impoverishes the vigour of the image so obtained, as it does, in fact, in all cases where the organic silver compounds are blended with a chloride emulsion. Curiously enough, however, the roughness of surface here spoken of is not so marked when a similar emulsion possessing this characteristic is spread upon paper, irrespective of the presence or absence of any preliminary substratum the paper may have received. c.c. of water, or sufficient acid to neutralize the alkali. Finally wo add and move them about in this solution for five minutes, after which we should wash them in two changes of water, and pass them into the borax bath above mentioned, which, if used freshly prepared and of the strength here given, will be found to yield satisfactory tones with less than ten minutes’ action, a result unattain able if the bicarbonate of soda bath has not been employed in the manner directed. We make a stock solution in the proportion of one part of borax to eighty parts of water, and of this we use -1 gramme or -15 grammes of gold tri chloride to each litre of the borax solution. Either of the mixed emulsions we have formulated, tone well in the baths above mentioned; but when solution of ammonium thiocyanate previous to fixing in the usual sodium thiosulphate (hypo) bath, the strength of which latter need not exceed ten per cent, of the fixing rendering inert the restraining influence of chlorine or the soluble chloride, citrate, and other salts. By washing the prints in three changes of water, a certain amount of silver in conjunction with the soluble salts which have not been acted upon by light can be abstracted ; notwithstanding the fact that the emulsion, previous to coating, shall not, by the colour test before mentioned, show the presence of un combined silver. As these salts are not beneficial to toning action, but, on the contrary, are detrimental to the toning bath, we recommend a thorough washing. Further, by soaking the prints in dilute acid solutions, common salt, acetate of soda, &c., toning action is, to a considerable extent, impeded ; but a similar treatment in alkaline solutions is found to be favourable to toning. Thus, in the case of an emulsion similar to the above, we should wash the prints to the extent generally adopted with silver prints upon albumenized paper, then transfer them to an alkaline bath composed of— Taking all things into consideration, we fail to recognize any distinct advantage in the use of the tartrate salts, finding, as we do, that a formula such as the following not only yields the finest possible results on glass, either for transparencies or opals, but can also be spread upon paper, These proportions are calculated to leave a slight excess of silver. Mix as directed on page 245. The emulsion is then set, and washed in two or three changes of water, the duration of soaking being, as heretotore, five minutes. The citrate emulsion is then filtered and blended with the chloride emulsion in proportion to the necessities of the work in hand. As a general rule, the proportions we have previously mentioned—viz., one of citrate to four of chloride—may be adhered to; and when larger quantities are employed than those herein stated, it may be found 1 c.c. 2 grammes in 40 have already shown. Images fixed without toning do not present an agreeable colour such as the majority of persons are accustomed to admire; for this reason, as also in the parent process, collodio-chloride, to produce an attractive result the films must be subjected to the influence of a toning bath. In seeking for a special toning formula, our experiments have covered a wide range, the result of which may be re duced to a small field, consisting of two or three com petitors only—viz., the Maxwell Lyte borax bath (sodium acetate and calcium), and the thiocyanate. Either of these forms of gold toning is suited to work with the formul already published, and, as a general rule, will give satisfaction when used. In the event, however, of a film proving refractory in the first named, it may invariably be finished in the last, and often this treatment is to be commended. From our remarks deal of the colour obtained by toning when the operation of fixing takes place, and unless the toning be carried to the stage of bleaching, the films yield images of a yellowish brown colour. Therefore, if a bluish image is considered preferable, such can be more easily obtained by varying the proportion of the organic compound in the manner we h.m17 -- mm-M Pim-, 09 MV 80- •u J •v-I•IVW •15) auu nuou 1m "n- o°.2 thing as regards rapidity or quality, such as we are wont acts similarly but preferably to the mixed hypo and gold to get when dealing with ordinary printing on albumen; toning bath; moreover, if the toning be followed by but, on the contrary, such prints appear to lose a good | soaking in a plain solution of the salt, it has the property Warm sufficiently only to ensure solution and mixture, then add- Silver nitrate ... ... ... 2 grammes Dissolved in distilled water ... 10 c.c. Upon testing this emulsion in the manner previously de scribed on page 150, it is found that there is an absence of free silver. The citrate emulsion is then made as follows : Uransparencles or OPd18, DuU -du dI• uc PPred— UPV— raPel ) - ‘8° 8 . ,1 and is in that condition equally amenable to the production commencement of this article, it will be gathered that such of good work. The formula does not materially differ films of gelatine do not present the same faclities for from a previous one we have given ; but the method here toning as are found with collodion and albumen. The o _ . : upper strata alone receive a deposit of metallic gold unless the employment of a more or less suspicious-looking an agent be employed capable of penetrating the gelatine crystal, such as the commercial article usually appears. film and neutralizing any acid contained therein, as well as judicious to add an antiseptic, such a, thymol in alcohol. u oupiy e uiyauau JI guu uiug —, Ammoniacal fuming does not appear at any stage to ingit with a few minutes’ soaking in a plain two per cent. confer distinct advantages upon gelatine films prepared as ’ " " ’ ,L ’ — in
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