"Black ink" is called "gold is not exchanged from the Mohist scriptures". The original words are "every ink is used every day, and only half of it is used at the age of one." If this is the case, 10,000 gold will not be changed. " Interpretation: Ink is used every day, and it is only reduced a little in one year. Such things can be exchanged for 10 thousand gold. So gold is the name of ink, which means that good ink is worth a thousand dollars.
Black ink, ink stick, is a long strip used on inkstone when studying ink, and ink comes from ink stick. In ancient times, rich scholars or grandfathers often asked extremely young maids to help them polish ink, but the pace of modern life is so fast that few people use it. Clean water is needed when grinding ink. If there are impurities in the water, the ground ink will be impure. Therefore, the ancients often said that the heart is right and the ink is right.
The history of Four Treasures of the Study:
Four Treasures of the Study is a unique painting and calligraphy tool in China, namely pen, ink, paper and inkstone. The name of Four Treasures of the Study originated in the Southern and Northern Dynasties. Historically, what "Four Treasures of the Study" refers to has changed frequently. Four Treasures of the Study in Southern Tang Dynasty refers to Zhuge Bi in Xuancheng, Anhui, Li Tinggui Ink in Huizhou, Chengxin Tang Paper in Huizhou, Anhui, and Weilong inkstone in Wuyuan, Anhui.
Since the Song Dynasty, "Four Treasures of the Study" refers to Xu Anbi (Xuancheng, Anhui), Huimo (Shexian and Huizhou, Anhui), Xuan Paper (Jingxian and Xuancheng, Anhui), (Shexian and Huizhou, Anhui), (Zhuoni, Gansu) and Duanyan (Zhaoqing, Guangdong, formerly known as Duanzhou). After Yuan Dynasty, Hubi (Huzhou, Zhejiang) became popular gradually, while Xu Anbi gradually declined. After the reform and opening up, Xu Anbi gradually recovered its vitality.
Refer to the above content: Baidu Encyclopedia-Four Treasures of the Study