The research project initiated by A. Baron Tacla from Universidade Federal Fluminense (Rio de Janeiro) immediately caught our attention. The technology used (RTI) seems indeed particularly well adapted to the Celtic coinages. They are as marked by a rather complex iconography as many non figurative types. Blanks are usually smaller than engraved dies employed as punches. The use of the RTI thus appears as a privileged way to better understand these objects, particularly those kept at the BnF – the most important Celtic coinages collection in the world, 11,000 coins – available to be used as a material for the development of this promising technology.