One thing on one has touched on yet, any copper-based alloy will react with Aluminum when wet. What that means is that if you leave an aluminum pan on a wet copper counter (or if you, like me, left a lasagna pan in the copper sink of the house you just bought) the copper will turn that aluminum into salt water and “eat” it away. It’s a pretty cool trick, but problematic when all of your sheet pans are aluminum.
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