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Blue immedial colours (1906)
Leopold Cassella & Co., author · Frankfort o.M. : Leopold Cassella & Co, G.m.b.H. · leaf 20
2 Immedial Indone 3B cone. pat. … Immedial Indone BF cone. pat. Immedial Indone JBN cone. pat.Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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