Union shades dyed in slightly acid bath : British patent no. 270⁰⁹ (1900)
Cassella Color Company · New York : Cassella Color Company · leaf 27
MANUFACTURE LYONNATSE DE MATIERES COLORANTES, LYONS. … Works “La Mouche”. RUSSIAN ANILINE COLOUR WORKS LEOPOLD CASSELLA & C 9, RIGA. Works at Riga. IHfc GETD CENTER LIBRARY
Leopold Cassella & Co · Dyes and dyeing · Color in the textile industries
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
