ELI5: Why is some porcelain microwave capable, while other will heat up and burn your fingerprints off?
My microwave will heat up my coffee in my *good* green mug. I can confidently grab it afterwards and the handle will be as cold as before.
If I, by mistake, grab my *other* green mug, which is pretty much identical to my *good* green mug, it will come out of the microwave with the temperature of the sun‘s inner core.