"Peter the rat"'s silver hand and Lupin's chocolate

[snapesmate]

No: HPFGUIDX 86212

It just occured to me, (yes I know a few years late but what the 
heck) Peter has that nifty new (GoF new anyway, LOL!) silver hand, 
right?  Well, is it REAL silver?  Or just silvery looking.  If it IS 
real silver, will it be a danger to Remis Lupin (werewolve/silver 
weapon) at some point?  There must be something significant about the 
fact that it is silver and if that fact has already been shown, I am 
drawing a total blank on it.  Also I have read a post that mentioned 
Lupin handing out tainted chocolate.  I do not recall canon that says 
the chocolate was "tainted".  Am I drawing a blank on that as well?
Lynnette, who thinks Snape IS a good guy, even if he is NOT a nice 
guy!