Abstract
In order to distinguish between the genuine gold coins of the “German Kaiserreich” and their counterfeits, X-ray spectral analyses of the coins were carried out nondestructively. The chemical composition of the genuine coins is sufficiently uniform and the instrumental analysis sufficiently accurate to set up definite criteria for the genuineness. The gold content of about 90% is a first, the silver content of about 0.4% a further criterion. Counterfeits frequently show some more gold, and often less or more silver. Several counterfeits also have an additional gold enrichment at the surface. This can be detected by using electrons instead of X-rays for the excitation since electrons penetrate only into the uppermost layer of the coins.
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