Tin lead alloys are mixtures of two soft metals that melt easily and flow smoothly. For centuries they were used to make everyday objects because they were simple to shape and strong enough for use. One famous example is solder, which joins metal parts by melting at a low temperature. The mix melts sooner than either metal alone, which makes it very useful. Tin helps resist corrosion, while lead adds softness and weight. These alloys were once common in pipes, dishes, and tools. Today their use