One day, I saw a man writing on a felt with water and a brush. The felt suddenly turned black and then gradually disappeared. What is that thing? how much is it?

When you start writing calligraphy, you should first prepare a writing brush, ink, a plate or ink box with a deep inkstone, a felt cushion table with a suitable size, and various papers for practicing calligraphy, such as tassel paper and meta-book paper. Pay attention to using rice paper or leather paper. There are many brands of brushes. If you are enthusiastic about practicing calligraphy, you can buy one with higher price and quality, and choose pens according to different copybooks. It is more appropriate to choose seal script, official script and regular script when you start practicing calligraphy. Many of the famous posts are representative: {seal script} Stone Sanpan, Mao, Taishan stone carving, Three Sorrow and Three Music Stickers, Deng and Wu Changshuo ink. {Lishu} There are many historical sites in Zhang Qianbei, Cao Quanbei, Chen Shi, Shimen Song and Huashan. Ou, Yan, Liu and Zhao are all famous. You can choose according to your own preferences. I recommend that you practice Chu Suiliang's classic Yin Fujing in the early Tang Dynasty, which is very distinctive.