The Dictionary Of Photography

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

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Gelatino-Chloride
Allow to soak for half an hour, and dissolve by the aid of a water bath, and add gradually, almost drop by drop, with constant stirring, the following at about 900 F. : -
Nitrate of silver ... ... ... ... 154 grs.
Distilled water         ... ... ... ... 336 mins.
Allow the emulsion to set hard, press through canvas, wash in four changes of water five minutes each, and drain well. Now prepare the following : -
Heinrich's gelatine ... ... ... ... 100 grs.
Distilled water ... ... ...... 150 mins.
Soak for half an hour and dissolve, and add the following at a temperature of 900 F., with constant stirring : -
Sodium citrate (neutral) ... ... ...      30 grs.
Distilled water ... ... ......     170 mins. .
Dissolve
Nitrate of silver ... ... ... ...      46 grs.
Citric acid ... ... ...... ...      77 ..
Distilled water ... ... ... ...     170 mins.
Add to the citrate and gelatine very gradually, constantly stirring, set quickly and wash in five changes of water five minutes each, drain well, and add to the chloride emulsion as above, and add
Citric acid............... 15 grs.
Distilled water ... ... ... ... 119 mins.
Allow the emulsion to stand in a fluid state for one hour, occasionally stirring. Keep for three days, and then coat the paper.
No. III. Mr. W. K. Burton gives the following. Two separate emulsions are made, as in the last case: -
A.
Ammonium chloride           ... ... ... 53 8rs-
Gelatine ...... ...... ... 420 ยป
Distilled water ............ 20 ozs.
Allow to soak for an hour, and dissolve by the aid of a water bath ; then add
Nitrate of silver ............ 150 grs.
Distillediwater         ............ oz.
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