This is a semi-manual pottery cup fired at 1300 °C, non-industrial porcelain, the black point of the cup and the texture of the transition surface. The mineral organic matter in the clay is reduced, which is the characteristic of the reduction of the organic glaze, emphasizing the details. Rich, showing a natural texture. The bottom of the cup is made of native clay, or there are some traces of grayish red. This is the iron in the clay. It is partially or slightly glazed. This is a normal phenomenon of manual kiln burning, not really cracking, nor Will affect the use, the above is not awkward, mind please also buy.
Due to shooting and lighting reasons, as well as differences in temperature in the kiln, or chromatic aberration within the normal range.