Diamine colours on cotton treated with sulphate of copper
A trade sample book of 1898 issued by the Cassella Color Company and Wm. J. Matheson & Co, published in Frankfort-on-Main, showing dyed cotton swatches for textile makers and dyers. The pictures are plain rectangles of dark fabric in black, navy, green and brown, each with a faint woven twill texture, and a designer could take from them a restrained palette of deep dark tones and the look of fabric weave rendered in print.
