Cassella Color Company · [New York : Cassella Color Co.] · leaf 31
DIAGRAM MANUFACTURE OF METHYLENE BLUE f^E DucTioN or — = NITROSO DIMCTHYLANIUNC … One of a series of wall charts supplied to the Smithsonian Institution Washington, by the Cassella Color Company Iwenty-five
Cassella Color Company · Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
