Chemical Composition: ICP-MS/AAA data from sample, Bronze:
Cu, 88.34; Sn, 9.48; Pb, 0.84; Zn, 0.012; Fe, 0.03; Ni, 0.06; Ag, 0.09; Sb, 0.43; As, 0.72; Bi, less than 0.025; Co, less than 0.005; Au, less than 0.01; Cd, less than 0.001
J. Riederer
Technical Observations: The patina is green with some blue, red, and black, as well as brown burial accretions. The surfaces are well preserved. The connections between the components are loose, but they do not separate.
The object is made of three components, all of which are solid cast. Their slightly imprecise shapes point to direct modeling of the wax models. The bottom surface of the smallest component is a fracture; part of this fracture surface predates burial, and part is more recent and shows very deep corrosion, up to 4 mm. Pairs of herringbone punch marks on the outside edges of the five discs on all three components are crisp shapes that were punched into the object after casting. Given its significant thickness, the pierced shapes of the largest disc would probably have been cut in the wax model; there are no saw marks in the interior surfaces of these piercings. The top and bottom surfaces of the discs show well-preserved abrasive finishing marks.
Henry Lie (submitted 2012)
