The Dictionary Of Photography

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

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Bromide Paper
which contains plenty of iodide of silver,    is not strongly
ripened, and contains plenty of gelatine."     He suggests the following: -
No. I. For Black Tones.
A. Ammonium bromide ... ... ...         20 parts.
Gelatine ...............  50 - 80 ,,
Distilled water ............       400 ,,
Allow the gelatine to soak in the water for twelve hours, then dissolve at a temperature of 50 - 6oo C, and add the bromide ; then in the dark room add gradually, with constant and violent shaking, the following solution heated to 50 - 6oo C.: -
Silver nitrate           ... ...... ... 30 parts.
Distilled water         ............400 ,,
Allow the solutions to stand from half to one hour, and then pour out into a flat dish to set. When thoroughly set break up into small pieces, and wash in the usual manner.
No. 2. For Brown Tones. A. Ammonium bromide           ... ... ... 18 parts.
Potassium iodide Gelatine Distilled water B. Silver nitrate Distilled water
......2 - 4 ...
50 - 80 ..
...... 400 ..
...... 30 M
...... 400 M
The directions for making the same as above. This (No. 2) emulsion gives dark brown tones with ferrous oxalate. If 20 parts of citric acid be added to No. 2 A the tone is brighter. If the citric acid be omitted, and 4 parts of ammonia be added instead, the tone is a darker brown. Commercial bromide paper is usually sold in three grades - A, smooth surface and thin paper suitable for mounting and small prints; B, smooth surface and thick paper suitable for larger prints and book illustrations ; and C, rough surface and thick paper suitable for enlargements. Some manufacturers also issue a special extra rough paper, and others a paper which has a highly glazed surface slightly tinted and obtained by coating tinted baryta paper. (See Baryta Paper.) It is usually stated that a particular class of negative is more suitable for bromide paper, but almost any negative may be used provided a suitable paper be chosen; for very