Pulp penetration. Macroscopic traces of the surface of the orange peel pattern in the form of pulp penetration. "Orange peel pattern" is the jade "oxidation raised" a visual effect, refers to the jade after a long period of time, by the underground environment of acid and alkali composition and temperature and humidity changes in the impact of the jade surface will produce oxidation, erosion, after the formation of a kind of bumpy The surface of a jade object will be oxidized and eroded, resulting in an unevenness and antiquity of the surface. As this surface feature looks like an uneven orange peel under macro observation, it is commonly known as "orange peel pattern".