In ancient China, in order to prevent books from being damaged by bookworms, a Chinese medicine called "Ruxiang Vanilla" was put in it, which also made books emit a faint fragrance.

After the book was opened, its fragrance lingered, and it was loved by scholars and bibliophiles, which made it gain the reputation of "scholarly" and passed down from generation to generation. "

Brief introduction of rue vanilla

Rue Vanilla, also known as Cao Yun, is a perennial herb, which is produced in western China and has a special fragrance. Can be used as medicine, and has a spicy and cold feeling when chewing.

Because the ancients often put this kind of grass in books to avoid moths and insects, except that "Yunren" refers to farmers and "Yunyun" refers to many, most of the words related to the word "Yunyun" are related to books, such as "Yunbian" refers to books, "Zhang Yun" refers to books, "Yun Ge" refers to libraries and "Yunbu" refers to libraries.