The modern practice of retouching negatives, as practiced by M. Piquepé and other experts, French, English and American (1882)
Piquepé, P. (Paul), Piquepé, P. (Paul). Traité pratique de la retouche des clichés photographiques. English. Selections · New York : Scovill Manufacturing Company · leaf 34
CTICE OF RETOUCHING. tives and enlargements the same work has to be done, and always in the same way. It will be seen, then, that in the art of retouching negatives it is only in the first step that any difficulty is to be met with, because, being the most important, all the rest follows from it,…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
