AFAIK, shellac is OK on iron, but tin cans are usually lined with tin (or
whatever these days)...most items will eventully draw water to them after
opening, thus creating at least a potential for rust. The lining, I'm told, is
to prevent rust from that source. There are vegetables that do create such a
problem, and most of those cans today have some kind of white lining, a plastic
"Ambition is a poor excuse for not having sense enough to be lazy." Edgar
Bergen, (Charlie McCarthy)
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