It might be cadmium On 13/06/2015 16:45, John Wilson wrote: > On Sat, Jun 13, 2015 at 11:20:19AM -0400, Noel Chiappa wrote: >> So, what _is_ that grey coating - and, more important, how (if at all) can it >> be reproduced these days? > Wild guess: some kind of oxide? I agree that it doesn't look like paint > or powder coat. > > John Wilson > D Bit