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31-52-45 Micrographs

 

 

Inv. 31-52-45
Snake
A cut completely across the tip of the tail: magnification, 200x (left and right)
Etchant: for micrograph on left: Klemm’s III; for micrograph on right, Ammonium hydroxide + hydrogen peroxide + potassium dichromate
(Sn, 7.3%; As, 0.31%; Ni, 0.24%)

The microstructure consists of polyhedral grains that, in their twinning, are indicative of an annealing treatment after moderate cold-working (left micrograph). Small inclusions are scattered unevenly through the metal and most likely are remnants of non-metallic material (matte) that became entrapped in the copper during its original smelting (right micrograph).

Microhardness VHN: 105 ± 13 (n=5)
Uniform, though the VHN range (127 to 89) is evidence for somewhat heavier working close to the artifact’s surface.