Early Work In Photography
A Text-book For Beginners

The After Treatment of Negatives. 91 mercury with ammonia. The silver cyanide method is as follows: . T I . Mercuro-Silver-Cyanide Intensifier. A.—Mercury perchloride...... ••• 60 grains Potassium bromide ... ... ••• ” Water to ......................................20 ozs B.—Silver nitrate ... ... - 120 grains Potassium cyanide (pure) ... - 120 „ Water to ... ... - - 20 ozs The solutions must be kept in separate bottles, and should be made up at least a day before required for use, being frequently shaken until dissolved. A sediment will be found in the bottle containing B, but this should wof be re- moved. When required for use, the clear solution should be decanted from the sediment, and, after use, returned to the bottle and well shaken. .1 _n cleanliness These two solutions will, with proper care and cleanliness, serve to intensify many negatives, and will keep indefinitely. The negative before intensification must be well washed. at least an hour to free it from hypo, otherwise stains will be the inevitable result. If the negative has been dried, is must be well soaked in clean water until the gelatine A cois swelled, and then be immersed in some of solution. Acte- tained in a clean tray ; a black vulcanite tray should, beore ------- forth. If the plate has been properly washed, a gradual top’s appears white; the negative must then be removed ana well washed for about twenty minutes clean porcelain After it is washed, it must be placed in aBelanplied as in ernes complete. The negative must then be once more wasn a and put away to dry.