The chemistry and technology of mixed paints (1907)
Toch, Maximilian, 1864-1946 · New York : D. Van Nostrand Company · leaf 86
No. 21. Artificial Graphite (Ache- No. 22. American Washed Ochre — son) — Photomicrograph X250, con- Photomicrograph X250, of the same tammg 90 per cent of carbon. composition as French Ochre.
Paint · Pigments
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
