Halbwoll-Echtfarben = Colorants solides pour mi-laine = Union fast colours
A dye-sample book issued by Leopold Cassella & Co. of Frankfurt am Main in 1890, presenting fast colours for half-wool fabrics in German, French and English. Its pictures are rectangular swatches of dyed cloth in orange, red-orange and yellow, each paired at two percent and four percent dye strength with its trade name printed beneath, useful for a designer checking how a single hue deepens with more dye.
