Inside Out Library · ExploreUnion shades dyed in slightly acid bath : British patent no. 270⁰⁹ (1900)Cassella Color Company · New York : Cassella Color Company · leaf 2Leopold Cassella & Co · Dyes and dyeing · Color in the textile industriesInternet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.More pictures from Union shades dyed in slightly acid bath : British patent no. 270⁰⁹More like this
