Chemical Composition: ICP-MS/AAA data from sample, Bronze:
Cu, 86.22; Sn, 11.53; Pb, 1.86; Zn, 0.042; Fe, 0.1; Ni, 0.06; Ag, 0.05; Sb, 0.12; As, less than 0.10; Bi, less than 0.025; Co, 0.015; Au, less than 0.01; Cd, less than 0.001
Technical Observations: The patina of 1895.202.A is very dark green with erupted areas of light green. There are small areas of the surface that are well preserved, but most areas are disrupted by heavy corrosion products. The metal is very mineralized.
Because of their heavy weight, the rings (1895.202.A, 1895.202.C, 1920.44.219, and 1977.216.2123.13) appear to have been cast. However, there is no physical evidence of casting. All of these rings are at least slightly non-circular, especially 1977.216.2123.13 and 1895.202.C, the two heavier rings. The gentle ridges on these four rings are carefully planned as subtle decorative elements, each ring with a slightly different profile of facets. The ridges, although smooth, show slight irregularities. These seem more consistent with finishing the wax or pre-wax model by turning rather than cutting the metal ring with a turning process.
Henry Lie (submitted 2002)