Elliptical curry tableware M kiln turns black

Before using a microwave or dishwasher, please refer to the instructions on using a microwave or dishwasher.
After prolonged use, small cracks (penetration) may appear on the surface of the vessel, but it does not affect normal use.
Containers with a matte texture may sometimes be stained with oil or color from food.
When purchasing stoneware products, there may be some penetration.