Direct dyes for cotton.
A 1917 trade booklet published in New York by the National Aniline & Chemical Company, aimed at dyers and textile mills, explaining direct dyes for cotton. Its pictures are sample swatches of dyed yarn tied into bows, shown in rows of blues, purples, pinks and greys, plus a pen-and-ink view of a tall office building with street traffic; a designer could take from the swatches a clear way to present colour ranges as paired samples with percentage labels.
