Woods Metal

Wood's metal, also known as Lipowitz's alloy is a metal alloy that is useful for soldering and making custom metal parts, it can be used for a variety of things such as work holding, mould making, tube bending etc. but its vapor is toxic to touch or breathe.
The alloy is named for Barnabas Wood, who invented and patented the alloy in 1860. It is a eutectic, fusible alloy of 50% bismuth, 26.7% lead, 13.3% tin, and 10% cadmium by mass. It has a melting point of approximately 70 °C (158 °F).