Telling nickel silver apart from brass?

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I have some key blanks made of either brass or nickel silver. I can't
tell for sure visually. Is there a easy chemical test using commonly
available chemical to test for presence of substantial amount of nickel
in the alloy? (Brass=no Ni, Nickel silver contains Ni, Cu and Zn )
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I would guess the acid test. Puke on it and see whether it's green (NiClx) or/to shore (CuClx).
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Autymn D. C.

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