Abstract
A set of 23 silver Celtic-looking coins were analyzed by micro-XRF in order to obtain data about their chemical composition (purity of silver and trace elements content) in relation of the coin type. The aim was either to confirm or reject the hypothesis about ancient imitation of the so-called “Celtic” coins. The results show that very pure silver (approximately 85-93 % Ag), copper and tin as macro-components (%) with traces of iron, gold, bismuth, chromium, nickel, zinc had been used. Statistical treatment (correlation and cluster analysis (CA), principal component analysis (PCA), and factor analysis (FA)) allowed contextualization of the analytical results and permitted to obtain a better knowledge of the used metal alloys and manufacturing procedure of the investigated Celtic-looking coins. Numismatic expertise was also done and the hypothesis about ancient imitation was confirmed on the basis of the expertise and the elemental composition of the coins.
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