Fritz Matthies-Masuren, (1873-1938) of Berlin, was an artist, photographer, writer, collector and German as well as European champion of pictorialism.  “He attached the greatest importance to gum bichromate, as did most Austrians and Germans.” 1.

1. footnote:  J. Craig Annan: Selected texts and bibliography: Edited by William Buchanan: Clio Press: 1994 : p. 80