A complete treatise on the art of retouching photographic negatives : and clear directions how to finish & colour photographs (1898)
Johnson, Robert · London : Marion · leaf 197
seTCartridges are made up, one of Pyrogallic Acid, and the other of Sulphite of Soda and Carbonate of Soda in correct proportions. A presei'vative is mixed with this developer to prevent its staining the lingers, as is the case with the ordinary Pyro-Soda Developer. Directions. — Take one each Nos.… … These Cartridges consist of pulverised Hyposulphite of Soda and Theonine in correct proportions, and packed in specially prepared tubes. Being in powder they dissolve very quickly, and their portable form specially commends them to travellers and tourists. Directions. — For fixing Plates, mix…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
