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
