The komast (reveller) holds up either a beaker-shaped cup or krotala (castanets). The figure was painted onto the surface of the vase in added white. The procedure is known as Six's technique, after the Dutch scholar who first studied it.
Hoppin, James C. and Albert Gallatin. 1926. Corpus Vasorum Antiquorum, USA 1, Hoppin and Gallatin Collections. p. 106, Gallatin pl. 60.11, Cambridge, MA: Harvard University Press.
Fehr, Burkhard. 1971. Orientalische und Griechische Gelage, : no. 229, p. 156.