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The title should say it all. I have a pestle but lost the mortar that belonged to it and wonder if I can use it with my ol' plastic bowls.
Yes you will damage plastic. At the very least, you will scratch them. At worst, you will get plastic dust in your food. Don't do it.
If you don't believe me, take empty plastic bowl (one you don't mind damaging) and push pestle against it's wall. You will see for yourself.
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