1. Dry grain surface of leather glaze: Dry grain surface of leather glaze is a decorative effect applied to ceramic surface. Sprinkle fine granular substances, such as quartz powder and sand, on the surface of ceramic products and attach them to the glaze before it dries.

2. Wet grain surface: Wet grain surface is a decorative technique in the process of ceramic production, also called wet sprinkling. In the production process of ceramic products, when the glaze is still wet, granular ceramic materials, such as clay particles and quartz powder, will be sprinkled on its surface, and these particles will combine with the wet glaze to form a unique texture and decorative effect.