Hi Rav Sperling,
Is one allowed to heat up cosmetics in the microwave or would this trief the microwave. For example, often hair treatments require warming in a microwave. Thanks so much!
What an interesting question – thank you! In fact it is permitted. This is because there is no 'treif' food in the cosmetics – it is not considered as food at all. That is why you can heat up a plastic plate, even though it does not have hechsher, because it isn't food.
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