How are some mugs with metallic looking coated handles (goldlike) microwave safe? It even says on the bottom. While other metal coated ceramics cause sparks. What is fine to microwave safe them?

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Answer (1 of 3): The sparks come from the fact the metal coating has a high resistance due its being thin. Gold decorations are expensive so they are thin and cause the arcing. A thick metal covering several thousandths thick can have a low enough resistance to reduce ohmic heating. Each piece of

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