Science Daily has an interesting article about how the patina on ancient Mali sculptures was obtained.
ScienceDaily (2007-12-08) — Scientists are reporting for the first time that sculptors from the fantastically wealthy ancient Empire of Mali — once the source of almost half the world’s gold — used blood to form the beautiful patina, or coating, on their works of art.
American Chemical Society (2007, December 8). Ancient Blood Found On Sculptures From Kingdom Of Mali. ScienceDaily. Retrieved March 23, 2010, from http://www.sciencedaily.com/releases/2007/12/071203091232.htm
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