Hydron blue pat. and hydron violet pat. printed on cotton
A dye sample card issued by the Cassella Color Company of New York in 1900, showing cotton yarn dyed with Hydron blue and Hydron violet shades for trade customers. Each page pairs a twisted cotton skein tied into a bow with its dye percentages and paste or powder formula printed beneath. Designers can take from it the muted slate, grey-blue, taupe and khaki tones and the way each swatch is labelled with its recipe.
