Does anyone know how to cause that to happen in a reliable way? All I can find are ways to prevent it, not cause it in a reproducible way. I wonder what metal that is on the faucet, too, since most seem to be chrome or nickel plated, but I'm mostly finding references to aluminum and steel. FYI, I'm not thinking about doing all my plumbing fixtures, but maybe using it as an element of metal-based artwork.