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Union shades dyed in slightly acid bath : British patent no. 270⁰⁹ (1900)
Cassella Color Company · New York : Cassella Color Company · leaf 15
DIAMINE COLOURS DYED IN A SLIGHTLY ACID BATH. 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.
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