Application of dyestuffs to textiles, paper, leather and other materials (1920)
Matthews, J. Merritt (Joseph Merritt), 1874-1931 · New York, Wiley · leaf 121
m in the filtered water, is to place a sample, about 50 cc.of the water, in a porcelain dish, add a few drops of acetic acid and then afew drops of a solution of hematoxylin; if a pinkish or violet color per-sists after stirring, it indicates the presence of alum, but if the color issimply brown… … Fig. 90.—Gravity Filter. (Hungerford) type of gravity filter. Both use sand as the filtering medium, but thepressure filter is more easily regulated and adjusted to the needs at hand;also it occupies much less space, and if of the proper type is very readilycleaned by simply reversing the flow of…
Dyes and dyeing · Textile fabrics
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