Bersch, Josef, 1840-1907, Bersch, Wilhelm, 1868-1918, Salter, Charles · London, Scott, Greenwood, & Son, New York, D. Van Nostrand Company · leaf 75
60 EARTH COLOURS collector, has been found very suitable for colour works of various kinds (aniline, lead, mineral and other colours), particularly on account of the suppression of dust ; whilst the automatic charging worm greatly increases the capacity as compared with charging by hand. … FIG. 13. LEVIGATION The effect of levigation is based on the circumstance that bodies of greater density than water remain longer in suspension in that medium in proportion as the fineness of their particles increases. This treatment consequently enables the finer portions of a substance
Pigments · Coloring matter
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