I feel like this is a good one. I put this ceramic mug in the microwave sometimes and overtime this black sludge appears in the outside? What is it and why do

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2022 will mark the Queen's Platinum Jubilee – a celebration of 70 years service as Britain's monarch. We thought we would celebrate this in our own

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Our 11oz ceramic coffee mug is built from solid premium ceramic and features the printed design shown on the image preview. If it's a gift or just

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What is this growth on my mugs after I microwave them? : r/whatisthisthing

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Why does my mug get a slippery layer on it when I leave it in a bucket full of water for one night? - Quora