Das Färben der Baumwolle und verwandter Fasern mit den Farbstoffen
A German dye-sample booklet from 1902, issued by the Frankfurt firm Leopold Cassella & Co. for textile dyers working with cotton and related fibres. Its pictures are swatches of dyed cloth, each labelled with a dye name and strength in percent, shown as flat rectangles of colour in blue, black, orange and red. A designer could take from them the way a single dye shifts in depth and tone across concentrations, and the diagonal twill weave visible in the fabric.
