Fig. 8

a X-ray diffraction patterns taken on the reverse and obverse sides of the un dinero coin. Asterisks indicate the single face-centered cubic phase indexed with a 3.645 Å unit cell. Arrows indicate the small peaks of the silver used for plating. b XRD patterns of the 1899 dinero compared with two modern Peruvian struck coins and the simulated pattern of an ideal non-textured nickel silver alloy. The peak position and intensity of the (111) plane have been normalized whereas the simulated data has been shifted for ease of comparison