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The foil will spark and possibly set the microwave on fire. NINJAWOLF99's answer:

When I put maynase packets in the microwave to heat them up, after only two seconds, a large, blu flash could be seen on the inside. I was VERY lucky the thing didn't set on fire. I took them out. 1) They did not melt 2) They still felt cold.

Answer: No.

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13y ago
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14y ago

Yes and No

Tin foil acts like an insulator for microwaves.

If you put a frozen hot dog in the microwave, but wrap half of it in tin foil,

One side will be cooked, the other ( Under the tin ) will be frozen.

If you put a LOT of tin foil in the microwave, in such a way that the microwaves cannot "see" the food, it may cause the microwave to "think" that it is empty. And may seriously damage the microwave producer.

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13y ago

I'm not quite sure exactly what you are doing with the tin foil and plastic wrap, but neither of these things should be put in the microwave. Any metallic item, including tin foil, should never be placed in the microwave, bad things will happen. As for plastic wrap, it would likely melt pretty quickly and into your food, in any case, as it was melting it would probably release gases that wouldn't be good for your food, either.

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15y ago

Because it will cause a reaction that will explode

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12y ago

metal reflects the microwaves sending them back and damaging the magnatron tube , that is what produces the microwaves.

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9y ago

It arcs. If it's the only thing in the microwave, it's bad for the magnatron.

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Q: Why cant you put foil in a microwave?
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