Painters' colours, oils, and varnishes : a practical manual (1906)
Hurst, George H. (George Henry) · London : Charles Griffin & Company · leaf 218
proportion as the latter is decreased so the proportion of the former must be increased. For soda ultramarine poor in silica — Kaolin, ..... 100 parts. Sodium carbonate, 100 ,, Coal, 12 „ Sulphur, 60 „ For soda ultramarine rich in silica- 1. 2. Parts. Parts. Kaolin, 90 100 Quartz, 10 Sodium… … 19 shows the shape of the Fig. 19. crucible and its lid. The mixture is packed rather tightly into these; sometimes what are called seggars are used, but the crucible form is better, as giving
Paint · Varnish and varnishing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
