Note 290 — Chapter XIX · (XXXIII.)

‘Si fermino col martello.’ The only practicable use of the hammer in connection with enamels is to pound the lumps of vitreous paste to a more or less fine powder, in which form they are placed over the metal. Theophilus, in chapter 53 of his third Book, ‘de Electro,’ ‘on Enamel,’ introduces the hammer in a similar connection: ‘Accipiensque singulas probati vitri ... quod mox confringas cum rotundo malleo donec subtile fiat;’ ‘take portions of the glass you have tested ... and break up each lump with a round headed hammer till it be finely powdered.’ Cellini also says the pastes are to be pounded in a mortar ‘con martello.’ Trattati, p. 30. It is not easy however to see how any sense of ‘pounding’ can be extracted from the verb ‘fermare’ which Vasari uses.