The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Albumen Process
applied. The plate is then allowed to dry spontaneously, or by a gentle heat, the latter being preferable.- The plate is now ready for sensitising, and as in this condition it will keep indefinitely a stock may be prepared. The plates are sensitised in a dipping-bath as in wet collodion, the following being the sensitiser : -
Nitrate of silver ... .........480 grs.
Distilled water ... ...... ... 10 ozs.
Glacial acetic acid... ... ... ... 1 oz.
Dissolve and add -
Potassium iodide ... ... ... ... 2 grs.
Shake well, allow to stand for half an hour, and filter. The plates must be sensitised in yellow or orange light, and should remain in the bath for about half a minute in summer to one minute in winter. After sensitising, place in a dish of distilled water for five minutes, wash under the tap, and dry. Plates thus prepared will keep, under proper conditions, for several weeks. The exposure, which should always be to daylight, will be about 30 to 40 seconds under a negative of average density. The developer is as follows : -
No. 1.
Pyrogallol...............      40 grs.
Acetic acid ... ... ... ... ...      35 mins.
Distilled water ... ... ... ...      10 ozs.
Citric acid......         .........      12 grs.
No. 2.
Silver nitrate          ......... ... 12 grs.
Citric acid............... 12 ,,
Distilled water ............ 2 ozs.
For use add two or three drops of No. 2 to No. 1. Before development give the film an edging of rubber solution, and place in a dish of warm distilled water for one or two minutes. Place the developer in a porcelain dish, and heat gently by the aid of a spirit lamp to iooo F. ; place the exposed plate in the hot developer, and the image will gradually appear and gain density, this being accelerated, if desired, by the addition of more No. 2. The developer must be maintained at the above temperature, although errors in exposure may be compensated
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