JapanSet of Four Green Kosui Soy Sauce Dipping Bowls 3 1/4 Inch

Is the glaze lead and mercury free?

Are these made of ceramic? I want to use them to heat wax fragrance cubes on electric warmer

Can you put them in the dishwasher? Has anyone ever tried?

Has the item you’re chipping changed slightly from the one pictured? (I had to return a recent order and wondered if it was a shipping mistake)