Some ceramic items shouldn't go into the microwave because they have metal embellishments or trim. Some ceramics have lead glaze, which means they're not food s

Some ceramic items shouldn't go into the microwave because they have metal embellishments or trim. Some ceramics have lead glaze, which means they're not food safe once cracked or chipped, but I can't say whether microwaving them would make them more dangerous or less food safe. > > For most Americans, they don't have glass plates/bowls at their work As a note, most people I've seen microwaving their leftovers at work were microwaving plastic because that's how they packaged the leftovers from home. If there aren't dishes at work, let alone a full kitchen, then leftovers are transported, heated, and eaten from the same container.