In article ,
says...

Salt is the traditional method. Paint it with a heavy brine, seal it
in a plastic bag in a warm place for several days and then buff it to
a shiny brown.

Best to strip off the tinplate first. Tin oxide is transparent.

But if it's any suggestion, the coffee can I keep my rock
salt for the sidewalk has a lovely brown, er, patina.

It could be art. Anyone want to buy some art?

Jim


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