Etruscan jewelry
The combination of metals was a basic technique. Essentially, there is no such thing as 24 carat gold jewelry. Massive gold is the most malleable metal. It is almost like wax. In order to have jewelry that can pass the test of time and gravity, the Etruscans had to combine their gold with other metals.
Conservation and restoration of shipwreck artifacts
Metal is a solid material that is hard, opaque, and shiny, with a good electrical and thermal conductivity. Metals are also malleable, this allows for metals to be hammered and formed out of shape without being breaking or cracking.