A treatise on colour manufacture : a guide to the preparation, examination, and application of all the pigment colours in practical use (1908)
Zerr, Georg, Rübencamp, R. (Robert), Mayer, Charles · London : C. Griffin · leaf 65
PREPARATION OF THE MATERIALS 43 Generally speaking, there are two chief methods of drying, viz., drying in the open air, and drying in closed rooms brought to the required tem- perature by artificial heat. Of course, the first-mentioned process can only be applied in countries having a suitable… … largely utilised in such climates. In all northern countries, however, the artificial heating of the drying-rooms must be resorted to, though sometimes the two methods can be combined — for instance, by manufacturing a large quantity of the most saleable colours in the summer-time, and drying them…
Pigments · Coloring matter · Dyes and dyeing
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