Application of dyestuffs to textiles, paper, leather and other materials (1920)
Matthews, J. Merritt (Joseph Merritt), 1874-1931 · New York, Wiley · leaf 521
THE MINOR NATURAL DYES residue being dried and heated in a test tube, wlion. if blood is present,ammonia and offensi^•e odors are given off. As already mentioned, Cutch contains two coloring principles; the oneis solul)le in cold water and is termed catechu-tannic acid, or mimotannicacid; the other… … Fig. 254.—SLx-Roll CakiKki Hydraulic. (11. W. Buttenvorth & Sons Co.) to stand for several days, when the catechin separates out and may befiltered off. The filtrate is evaporated to dryness and treated with alcoholto remove impurities. The product is a reddish brown powder soluble inwater and…
Dyes and dyeing · Textile fabrics
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
