Union shades dyed in slightly acid bath : British patent no. 270⁰⁹ (1900)
Cassella Color Company · New York : Cassella Color Company · leaf 24
WORSTEDS DYED IN A SLIGHTLY ACID BATH. % Diamine Brown 3G 1 % Diamine Fast Scarlet GFF pat. 2,5 % Oxy Diamine Black JB extra cone. pat. 0,2 % Naphtol Blue Black. … CASSELLA COLOR COMPANY, NEW YORK.
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.
