Application of dyestuffs to textiles, paper, leather and other materials (1920)
Matthews, J. Merritt (Joseph Merritt), 1874-1931 · New York, Wiley · leaf 712
ums.—If no starch is present, concentrate a portionof the extract by boiling; cool, and add three times its volume of alcohol.Dextrin or gums, if present, will be precipitated. These may be filteredoff and identified by burning. (3) Gelatin.—To a portion of the extract add some tannic acid… … Fig. 302.—Steam Finishing Machine. (Curtis & Marble.) of Fehlings solution, when a red precipitate of cuprous oxide will beformed in the presence of a sugar. (5) Irish moss (or other lichen jelly) may be considered to be presentif an organic substance is known to exist in the extract, and yet…
Dyes and dyeing · Textile fabrics
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