Photographic times and American photographer (1881)
New York : Scovill Manufacturing Co. · leaf 232
y 2 pressed Tablets, for the Extemporaneous grains) tablets of Preparation of the Various Solutions Used and Required to Develop and Fix SCHERING’S Plates and to Tone and Fix Prints. UnriYaled Pyrogallic Acid No Necessity for Scales. Dry and Portable. No Waste or Deterioration of Solutions. Price… … Look out for the It is genuine, too, the Best and see that you and Cheapest. get it.
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.