The chemistry and technology of mixed paints (1907)
Toch, Maximilian, 1864-1946 · New York : D. Van Nostrand Company · leaf 202
No. 55. Aspergillus Niger — No. 56. Ultramarine Blue, ground in Photomicrograph Xioo, old oil, very uniform and fine, — Photo- fungus found on paint. micrograph X250.
Paint · Pigments
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
