Yushan inkstone is a kind of replacement stone after the stone in She Yan Laokeng is exhausted, but its ink is not as good as that in She Yan Laokeng. Because Yushan inkstone is rich in resources, large in output, controllable in size and quality, and low in price, it has natural advantages in developing the product types of Yushan inkstone and She Yan tea tray.
The inkstone in the old pit has pure and soft luster and delicate touch, such as touching soft and delicate skin. The inkstone in the new pit is generally dull, or the texture is dry and messy, shiny and bright, and it feels rough or glassy.
The difference between She Yan Yushan material and old pit material lies in the quality, grinding and value of stone. She Yan Shi Bao Qing Ying, fine texture, firm and smooth as jade, silent ink. Rock belongs to Sinian system after its geological age, which is a kind of argillaceous slate one billion years ago. The average hardness of rocks is about four degrees, which is 0.5 degrees higher than that of end rocks. Because it moistens Shi Jian, it has the advantage of "Su Mo for many years, a drop of jade-like stone embellish", which is beyond Duan's reach.
Duanyan is valuable because the stone is tender, pure, delicate, moist, solid and tight. Duanyan made of it has the characteristics of breathing, grinding ink, not damaging ink and not freezing in winter. It is also related to the hardships of mining and production. The carving of this inkstone has a strong local style. Generally speaking, relief is the main method, and three-dimensional hollow carving is not used, but due to the influence of brick carving, deep knife carving will also appear between them.
She inkstone was built in the Tang Dynasty, with a history of 1000 years. According to "She Yan" written by Hong Jingbo, a poet of the Song Dynasty, during the Kaiyuan period of the Tang Dynasty, Ye, a hunter in Shezhou, chased animals to the Great Wall (place name). When he saw a mountain stream, it was like a city, beautiful and clean, and brought it back to the world. As a result, she inkstone became famous all over the world. It is clear that she inkstone began in the Kaiyuan period of the Tang Dynasty, which is beyond doubt.