As soon as it starts to turn an amber color (it will go from amber to black very quickly), stop the microwave and with
heavy oven mitts, remove the glass from the microwave.
As I threw the next load into the laundry, I heard a sort of thud sound, that didn't sound quite like t - shirts and pjs, but I just chalked it up to
the heavier oven mitts I'd thrown in earlier, and didn't think anything of it...