pelican said:
will have to research. I've always heard the top layer of chrome is clear and an abrasive is basically rubbing this layer off down to the nickel layer
Chromium plate is a HARD TOUGH BRIGHT SILVERY METAL, most definitely not 'clear'.
But is applied in a VERY thin coat (its very expensive, in any quantity).
Thats why they suggest you don't use metal polish on it.
The nickel usually found underneath is a yellowish-silvery metal.
The nickel underneath (and the copper beneath that) is optional though, a lot of brit factories appear to have applied chromium plate directly onto bare steel - they could get away with this because the steel was new and clean, and they applied quite a thick coat of chrome.
The modern replating of steel requires the copper and then nickel coats to ensure the final chromium coat will get good adhesion and have a good shine - otherwise the whole shebang may just peel off....
How do I know this = (hobby) certificate in electroplating.
Will have to try this aluminium foil trick though - heard of it, but not seen results/pic like that !
P.S. Stainless steel wool and phosphoric acid, used vigorously, are pretty good at removing rust spots from chromed steel. Use well-used s/s wool, or it may scratch the chrome...