The manufacture of mineral and lake pigments, containing directions for the manufacture of all artificial artists' and painters' colours, enamel colours, soot and metallic pigments (1901)
amongst different vessels, with a certain quantity of water, on the one hand the bark can be exhausted completely, and on the other very concentrated solutions (" bark extracts ") obtained. The process patented by Kohlrausch is based upon the principles just stated ; it can be used to obtain tannin… … FIG. 40. understood from the following description that fine bark meal or finely-rasped dye-wood could not be worked. The apparatus consists of a number of 10 to 20 extractors connected together, also with a water tank above, and with a boiler. A single extractor is represented in section in Fig.…
Pigments · Dyes and dyeing
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