Casting the Perseus with household pewter
Around 1549, while casting his bronze Perseus for Duke Cosimo I de' Medici, Cellini fell ill with fever, his workshop caught fire, and the molten bronze 'caked' in the furnace. He revived the melt by adding oak wood and then throwing in about two hundred pewter plates, bowls and dishes from his own household. The statue came out complete except for the toes of one foot, which he added afterward. The Duke had predicted the pour would fail, and Cellini tells the episode as proof against his doubters.