Is it intentional that the porcelain cup leaks glaze?

The glaze leakage of the porcelain cup is intentional.

This is a special ceramic production process, also known as "leaky glazed porcelain". Leaky glazed porcelain is a unique form of traditional ceramic technology in China. In the process of making, it deliberately leaves some areas on the surface of porcelain that are not covered by glaze, so that the glaze of porcelain presents a unique effect.

The manufacturing process of leaky glazed porcelain is complicated. First, porcelain needs to be fired, and then a special glaze is coated on the glaze. This kind of glaze will produce some bubbles in the firing process, thus forming glaze leakage effect on the surface of porcelain. The glazed surface of leaky porcelain usually presents irregular spots, or some lines and patterns, which give people a unique aesthetic feeling.