Silver

Silver is valued in blacksmithing for its affinity with magic. By itself, silver is far too expensive and weak to be used in the crafting of weapons and armor; however, as an alloy of iron, it gains strength while retaining its magical properties.

Silver weapons and armor are, naturally, exceptionally shiny, but also very susceptible to corrosion. It is therefore necessary to keep them well-oiled and well-maintained, if one cares about appearance. However, unlike pure iron, a silver alloy will only corrode on the outside; the oxidized silver will protect the inner iron from further rusting. So, if one does not mind a black patina on one's weapon or armor, one may ignore these duties.

For some reason, silver weapons seem to be able to affect incorporeal creatures, where other weapons do not.