For casting toys in lend, the moulds are made of cast iron. The metal used for these toys is an alloy composed of bismuth 8 parts, lead 5 parts, and tin 3 parts: this melts at a low temperature (2020 F.) and expands on cooling, and so fills all the fine lines of the mould, giving a sharp, clean casting. The mould should be brushed over with blacklead and "warmed before it is used.