This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
China silk is thoroughly and carefully washed to free it from dressing, and then immersed in the following solution:
Sodium chloride. ... 4 parts
Arrowroot......... 4 parts
Acetic acid......... 15 parts
Distilled water...... 100 parts
Dissolve the arrowroot in the water by warming gently, then add the remaining ingredients. Dissolve 4 parts of tannin in 100 parts of distilled water and mix the solutions. Let the silk remain in the bath for 3 minutes, then hang it carefully on a cord stretched across the room to dry. The sensitizing mixture is as follows:
Silver nitrate....... 90 parts
Distilled water...... 750 parts
Nitric acid......... 1 part
Dissolve. On the surface of this solution the silk is to be floated for 1 minute, then hung up till superficially dry, then pinned out carefully on a flat board until completely dry. This must, of course, be done in the dark room. Print, wash, and tone in the usual manner.