• copper ⪢⪢
http://qindex.info/i.php?x=13303

• copper ⪢⪢
http://qindex.info/i.php?x=13290

○○○ won't ⪢⪢
Pans that are a hundred percent copper, a hundred percent aluminum or non-magnetic stainless steel won't work.
http://qindex.info/i.php?x=16045

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