Original Solution. | |||
---|---|---|---|
1.— | Silver nitrate | 50 | grains |
Water | 1 | ounce | |
Modified Solution. | |||
18 2.— | Silver nitrate | 50 | grains |
Ammonium nitrate or sodium nitrate | 50 | " | |
Water | 1 | ounce |
The reason of the addition of the ammonium or sodium nitrate is that prints are better obtained on paper which is not absolutely free from water. When very dry, the liberated chlorine (see page 32) is apt to attack the albuminate, whereas it is deprived of much of its activity when it is able to be absorbed by water, which, in the presence of light, is decomposed into hydrochloric acid and oxygen.[10]
Hydrochloric acid can attack the silver nitrate present in the pores of th
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