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)
146 MINERAL AND LAKE PIGMENTS. which is deeper in the middle and has two fireplaces, b. The low arch surmounting the hearth is covered with sand in order to prevent cooling. When finished, the red lead is drawn out of the furnace and finely ground under edge-runners, or occasionally levi- gated.… … FIG. 27. that at which the angles of the muffles, when these are used, begin to show a dark red glow. Orange lead, which is a brighter variety of red lead, is prepared from lead salts ; white lead or lead nitrite is used for this purpose. The latter salt is made by the process of Pischon, by…
Pigments · Dyes and dyeing
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