Is it underglaze or underglaze to buy a bowl?

"Over-glaze color bowl" refers to drawing patterns on the glaze with pigments and then firing them at high temperature. The "under-glaze color bowl" is made by drawing patterns under the glaze with pigments and firing at high temperature. The firing temperature of the latter is about 600℃ higher than that of the over-glaze color bowl, so the "under-glaze color bowl" is more stable. Moreover, the paint of the under-glaze color bowl will not fall off due to cleaning and friction.