International audienceThe discovery of two mutilated vases, a 1st century flask and a 2nd-3rd century carinated beaker in Amboise and Tours (Indre-et-Loire), bearing partially similar graffiti, is the source of the present study. Thus, the first vase contained a therapeutic preparation intended, according to Pliny the Elder, to treat a skin infection, while the second, partially charred, contained poached red wine. Comparisons made with the graffiti - a similar sign to the letter A, an eight-pointed star and the beginning of a Greek alphabet engraved on one of the vases - lead to the identification of charaktêres, similar to those found on some beneficial magic amulets, intended to reinforce the effectiveness of medical products. These vase...