What does alchemy mean? The ancients called writing with a brush dipped in cinnabar "alchemy". Later, some people called writing calligraphy. Alchemy: When Su Dongpo used poetry to comment on other people's calligraphy, he said, "This innocent calligraphy is better than mine, and he can be my teacher in writing." Some people saw that Su Dongpo had such a high opinion of this book and praised it greatly. I believe that Su Dongpo's comment on this word speaks of the essence of the book. What I said is wordy, do you understand?