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None that anyone can point to and say "yes, there is a danger" after over 40 years of testing them. Are they safe? Well, as safe as any. Except for highly acidic foods, sure. They are fine.
Generally aluminum forms an oxide over the metal. This is not very soluable. Most would say it is insoluable, but water will disolve most anything, even rocks and stones, so some degree.
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