Most dinnerware is microwave safe, and a few things about how microwaves work affect the result and the safety.
The Ware Should Not Heat Itself
Microwaves excite water molecules, so food heats and the container mostly does not.
A ceramic plate becomes warm from contact with hot food rather than from the microwave. That is normal.
A plate that is hot while the food is cool is absorbing energy it should not, which usually means moisture in the body through a crack or a porous glaze.
What Is Not Microwave Safe
- Anything with metallic decoration, banding or lustre
- Crazed or cracked pieces, which absorb water into the body
- Chipped pieces where the clay is exposed
- Repaired or glued items
- Anything marked decorative or not for food use
Where a range states microwave safety across collections, of the kind claimed at https://famiware.net/, that applies to intact pieces rather than damaged ones.
Superheated Liquid
Worth knowing because it causes burns. Water heated in a smooth clean container can pass its boiling point without bubbling.
Disturbing it then causes sudden violent boiling, throwing scalding liquid out. It has caused serious facial and hand burns.
Putting a wooden stir stick or a spoon in the cup, heating in shorter bursts, and letting it stand before removing all reduce the risk.
Uneven Heating
Microwaves heat unevenly, leaving cold spots, and that matters for food safety rather than comfort.
Stir halfway through, let food stand to equalise, and check that reheated food is hot throughout rather than at the edges.
This matters most with meat, rice and anything previously cooked and chilled.
Test an Unknown Piece
Empty piece plus a cup of water, short burst, then feel both.
Cover Loosely
Never sealed, which builds pressure.
Handle With a Cloth
Ceramic from a microwave is hot at the edges.
Never Reheat Twice
Portion before storing so food is heated once.
Rice Needs Care
Cooked rice held warm can develop toxins that reheating does not destroy.
Check the Base Symbols
Microwave and dishwasher marks are usually moulded underneath.
Stand Before Serving
Which evens out the cold spots.
Ceramic Holds Heat Longer
Than plastic, so a plate stays hot after the food has cooled, which suits serving and needs a cloth.
Do Not Use Cracked Pieces
Water in the body turns to steam and can split the piece.