↑ The Random House College Dictionary, Revised Edition, (1980). "Any of a class of natural earths, mixtures of hydrated oxides of iron and various earthy materials, ranging in colour from pale yellow to orange and red, and used as pigments. A colour ranging from pale yellow to reddish-yellow."
↑ Leroi-Gourhan, A. 1968. The Art of Prehistoric Man in Western Europe. Luân Đôn: Thames & Hudson, p. 40.
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