Hydron blue pat. and hydron violet pat. printed on cotton (1900)
Cassella Color Company · New York : Cassella Color Co. · leaf 23
Hydron Colours on Cotton Yarn (Self Shades) Hydron Violet Hydron Dark Blue B pat. G pat. 37 33 38 34 … 40 1 4% Hydron Blue G pat. Paste 20°/o lO»/o Hydron Violet B pat. Paste 20°/o CASSELLA COLOR COMPANY, NEW YORK.
Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
