Palestine: 5 mils 1927 km3, OK! But the alloys?

[Globetrotter]

Hi,

the light coin to the left doesn't really look or feel like cu-ni, but what could it be?

Light coin: weight 2.63 grs, 19.97 mm in diameter and 1.38 in thickness
Normal coin: weight 2.73 grs, 19.99 mm in diameter and 1.33 in thickness
Those differences fall well inside the normal tolerances.

Ole

[Figleaf]

Unless the two coins are significantly different in thickness, they must be of the same metal, because the weight and diameter are the same. I suspect that the one on the left is over-cleaned and under-neutralised after cleaning and that a sharp acid was used.

Peter