Inside Out Library · ExploreHydron blue pat. and hydron violet pat. printed on cotton (1900)Cassella Color Company · New York : Cassella Color Co. · leaf 37Works at Riga. ~iiiL Ci£TTV CLNItR LIBRARYDyes and dyeingInternet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.More pictures from Hydron blue pat. and hydron violet pat. printed on cottonMore like this