Which side of an aluminum foil should I put in contact with ...

Which Side of an Aluminum Foil Should I Put in Contact With...

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After some thought, I will go with the first argument, as it seems plausible (though I don't think it's accidental). As for coating one side with a layer, that seems unnecessary.

Assuming the second argument is correct, it probably doesn't matter which side you use. If one side is coated, that coating must be safe. Since aluminum foil is mainly used for packaging food, selling aluminum foil with a toxic film would have been called out over the past few decades.

In case the first argument is correct, it still doesn't matter which side you use. Aluminum oxide is not as dangerous as it is made out to be, especially when dealing with an oxide film on the foil. This process is called passivation because the foil becomes passive or inert. This explains why aluminum takes a long time to react with acids or alkalis.

To summarize, regardless of which argument is correct, it is safe to use either side of the foil.

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The reflective surface will reflect heat, and the matte side will absorb heat. When baking or defrosting, use the matte side up to absorb more radiant heat and reflect less infrared heat. Use the shiny side up during freezing to reflect heat away from the food.

A practical reason for having two visually different sides on the foil is to identify which side was initially used to wrap food. For example, if you unwrapped a cheeseburger and want to re-wrap it, using the wrong side can result in greasy fingers, which is annoying.

EDIT: I've read @Vedant's answer, and he provides a good explanation for the two surfaces being dissimilar. However, I don't dismiss the identification reason, as personal experience suggests it is valid. Without it, my keyboard would be greasy by now.

But I included @Vedant's explanation to provide a comprehensive answer.

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