Nickel silver

   When I tumble nickel (in steel shot), it comes out all grey and
yucky.  So, no. 

I tumble polish nickel-silver using ceramic media (Cerambits), and
it comes out wonderfully shiny (provided it went into the tumbler in
pre-polish state).

Judy Bjorkman

I am sorry Thomas, but nickel has ABSOLUTELY NO SILVER in it. It is
usually a copper nickel (as in brass) alloy. Mostly copper. What is
the source of your It is also known as german silver
and many other names.

Marlin