The spread of ancient coins counterfeits leads to historical and social distortions. Considering this, the need for adequate measures rises. In the last two years, the active collaboration of Bulgarian and international researchers within the framework of the ACCS Network and the project “Measuring Ancient Thrace” has provided a sustainable basis and new perspectives in this direction.
There is a dangerously increasing diversity in the production methodologies of the forgers. The Regional History Museum of Sofia, as a leading institution of cultural heritage preservation, has a substantial collection of both genuine and counterfeit numismatic objects. This paper will present the comparative results from ХRF analyses of the chemical composition of a representative selection of pairs of original specimens and their counterfeits from this collection. These results may provide priceless information which can contribute to forgery detection cases.