_Preparation of the Uranium Compound.—_Precipitate the nitrate of uranium
from its solution by concentrated liquid ammonia. Let settle the
precipitate, decant, and wash in several changes of water. Dissolve it by
heat in pure nitric acid, _taking care not to add an excess of acid._ The
ammonio-nitrate of uranium salt is then crystallized and dried. Mix a
solution of 6 drams of this salt, dissolved in 3 drams of water, to a
solution of 15 grains of silver in 30 minims of water, and crystallize.
This salt is called _ammonio-nitrate of uranium and silver._
SENSITIZING SOLUTION.
Ammonio nitrate salt 3 drams
Alcohol 8 drams
Distilled water 15 drops
Nitric acid, pure 1 drop
_Plain Collodion.—_Dissolve in a small quantity of ether 1 dram of Canada
balsam and 1 dram of castor oil, filter and let evaporate the solution to
the consistency of oil.