Spark testing: missing a piece to the puzzle.

Originally Posted by jonnyjeb

Let me piggy back on this thread. Several bathroom fixtures I've come across are heavy like brass, but still retains the silver color when run through a grinder and no sparks whatsoever. The yard told me it was die cast aluminum. Thoughts?

Agree with Mechanic that it's most likely die-cast zinc, also known as pot metal. Won't be aluminum, that's far too corrosive for bathroom fixtures.