Scientific American 2, 28.9.1850
Adulteration of Vermillion.
Prof. Horsford read a paper on the Adulteration of Vermillion. By the examination of a number of specimens he found that they had been adulterated from one half to two-thirds, and some samples sold for vermillion did not contain a particle of mercury; he found three specimens pure - one from China, one from Trieste, and one American. The adulterations were the chromate of lead and red lead.