Grant Erwin wrote:
I figure cans (e.g. soup cans) are steel plated with something. What I
really want to know is if they make acceptable electrodes for electrolytic
derusting.

GWE

They're steel, originally plated with tin. I think these days they're
often coated with vinyl or some other tough plastic instead.

Canned fruit seems to come in plated, rather than coated, cans.

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com