OVAL OVEN PLATE S JMA202202

On one of the two I bought, there were black spots that looked like dirt about 2cm from the handle to the center. I tried scrubbing them off, but they didn't come off, so I think they were there when it was fired. It doesn't look good, but the quality was fine, so I'm using it.

Until now, I've been making a large gratin dish for the whole family, but since we've started eating at different times, I bought this. There are various gratin dishes, and after much deliberation, I chose this one because it was light and simple, and it looked like it could be used as a plate. However, I regret that it doesn't have the handle (? ) that is characteristic of gratin dishes. The potholder touches the gratin...