Other forms of ancient books in China

In the Ming and Qing Dynasties, I also loved to make a "book cover" for thread-bound books, also called "letter". I lined them with cardboard, put a blue cloth on the outside, and wrapped the four loaves of the book with brocade. I put them together tightly with two bone tags, leaving only the root and the head of the book empty. This is called a "four-in-one set", and even the root and the head of the book are wrapped up. This is called a "six-in-one set". Some people also use two boards (called plywood) the same size as books to put cloth belts on the upper and lower ends to fasten the books. In addition, precious books are often packed in exquisite wooden cases or small wooden cases, and the title, edition and album number are engraved on the box surface and box surface.