experiments were performed in an effort to collect data for the
assessment of core material composition of antique bronze coins from
the nondestructive surface (patina) XFR-Analysis. To this purpose
measurements were carried out both before and after removal of the
was measured after Archimedes in water. Scales accuracy
was 0.01 g.
conductivity σ [MS/m] was measured with a Forester SIGMATEST
instrument, with an 8 mm probe, and selectable frequencies of 60, 120,
240, 480, and 960 Hz.
Electrical conductivity was measured on both sides of the coin in 4 to 10 positions (depending on the size) and minimum and maximum values were recorded.
was done in an OXFORD ED 2000 facility with a Ag X-ray tube. K-lines
were used for Ag, Cu, Sn, Zn, As, S, Cl, P, Na, Ca, Fe, and Sb; Kα for
Si; L-lines for Au, and Pb.