In China, writing brushes, ink sticks, paper and ink stones are called the Four Treasures of Study. The writing brush in Huzhou, the ink stick in Huizhou, the xuan paper in Xuancheng and the ink stone in Duanxi are the most f.
The writing brushes are used to draw the pictures on painted potteries（陶器）. They are m made of the hair of animals. Those made of wool are called yanghao and those made of the weasel's（鼬）tail hair are c langhao.
The ink stick produced in Huizhou is of high quality. A s goes like this: Two famous skilled men Xi Chao and his son produced a kind of high-quality ink stick. As a r, the Emperor Li Yu in the Southern Tang Dynasty agreed to give them the royal family name "Li". From then on, the fame（声誉）of the Li Ink Stick spread w. In the Song Dynasty, its producing area was changed into Huizhou, and it was then called the Hui Ink Stick.
Paper is among the four great inventions in aChina. The famous xuan paper appeared in the Sui and Tang dynasties. In Xuanzhou, it's said that Cai Lun's student Kong Dan took the job of producing paper，but he fto make perfect white paper. Later he happened to see the ebony（檀木）in the rivers. It got wet with the water and then t white. Then he used the bark（树皮）to produce the world-famous xuan paper.
The ink stone was already very pin the Han Dynasty. In Ming and Qing dynasties, Duan Ink Stone, She Ink Stone, Tao Ink Stone and Chengni Ink Stone can not only be used in writing and painting but also for admiration.
