| 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.
Of this, add 10 minims to a collodion made of
| Alcohol | 10 ounces |
| Ether | 20 ounces |
| Pyroxyline | 220 grains |
| SENSITIVE COLLODION | |
|---|---|
| Plain collodion | 12 drams |
| Sensitizing solution | 6 drams |
| Nitric acid | 2 or more drops |
Keep this collodion in the dark, as it is quite sensitive.
| PREPARATION OF THE PAPER | |
|---|---|
| Arrowroot, pulverized | 1 ounce |
| Water | 32 ounces |
| Solution of acetate of lead | 10 drops |
Heat to 100 deg. Fahr. and then add four ounces of albumen. The paper is floated on this solution for five minutes and hung up to dry. The sizing may also be applied with a sponge in the manner often described.
The proofs should be slightly over-printed and, before toning and fixing, placed for about ten minutes in the following solution:
| Distilled water | 40 ounces |
| Acetic acid | 1 ounce |
| Hydrochloric acid | 1 ounce |