well the best way to tell is to shave some tiny peices off with a razor knife where it won't hurt the engine case(flashing or fin on the outside) then put heat to them. if they ignite then they are magnesium
forgive my edit. I was just reminded by my son it takes "sparks" to ignite magnesium. it burns around 5300* F so be prepared.
Last edited by Yetti; August 17th, 2007 at 08:48 PM.