Pringle, Andrew · New York : Scovill & Adams Company of New York · leaf 48
sh well, and intensify with the pyro-silver solution, from which the alum may be omitted. The greatest trouble we have ever found with this process has been slipping of the film under washing. If the substratum be properly applied, or the edging before coating, and before development properly…
Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
