Foil reaction

Found my own answer. Caused from the salt in the ham (I even soaked in plain water for 10 hours to extract some salt). The deposits are not actual metal but rather aluminum salts. Supposedly harmless. A new one on me!

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Tomatoes and other foods with high acid content also cause reactions--sometimes eating holes in the foil.

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Bevi added 4 months ago

Putting a layer of parchment paper between the food and the foil creates a barrier so the foil will not react.

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I don't wrap food directly in foil or plastic wrap anymore--I always use parchment paper first.

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