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1 "Burnt" ceruse. This was, in fact, one of the varieties of "minium," red oxide of lead, our red lead. Vitruvius and Dioscorides call it "sandaraca," differing somewhat from that of Pliny.
2 In Chapter 10.
3 See B. xxxiii. cc. 56, 57.
4 It was possibly owing to this that the colour known as "umber" received its name, and not from Ombria, in Italy. Ajasson says that shadows cannot be successfully made without the use of transparent colours, and that red and the several browns are remarkably transparent.
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