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Nickel silver is actually a copper alloy even though it is silver in color.  The alloy of nickel silver typically used in our industry is 770 and has a 1/4 hard temper.  The recipe for making nickel silver is approx 55% copper, 27% zinc and 18% nickel.  The addition of zinc & nickel give the final product the silver color & makes it very hard.  Because this is still a copper based metal it can be engraved & will oxidize black.  This material is not recommended for outdoor use.