Note 1478 — COBALT, ZAFFER, SMALT.
William Johnston translation
Recherches Philosophiques sur les Egyptiens et les Chinois. Berlin, 1773, i. p. 345.—Delaval’s Experimental Inquiry into the Cause of the Changes of Colour in Opake and Coloured Bodies. Lond. 1774, 4to, p. 56.