How to make a sword bookmark?

The practice of sword bookmark is as follows:

Take out the square cardboard and fold it diagonally. Fold the four sides in half to the center line to form a small triangle, and then fold the lower half upwards. Open it and fold it again along the crease. Fold the top half down. Turn to the back and fold inward, and fold the hilt inward again.

Bookmark is a kind of reading label, which is made of paper, electronics, plant leaves and metal. Used to inscribe the title of a book, usually attached to the upper left corner of the cover of an ancient book, sometimes with the book number, the name of the inscriber and the reading place. A bookmark is a small piece of paper sandwiched in a book to record the progress of reading. With the development of the Internet era, electronic tags are derived to record reading progress and experience.

Bookmark pictures are random and widely used. Even used train tickets and plane tickets can be used as bookmarks. In addition to graphic content, art bookmarks are often innovative in materials and shapes. Bookmarks are more convenient than folding books and do less damage to books, so they are a good way to remember page numbers.

Bookmarks are not only paper, but also high-quality pure copper-zinc alloy, such as nickel-plated paint, sand-plated nickel, antique copper, pad printing, gold-plated paint, two-color electroplating, nickel-plated enamel, nickel-plated inlay and so on. This bookmark is called metal bookmark, which is an innovation in bookmark development. During the temple fair, you can see many metal bookmarks on Facebook, which represent the traditional culture of China.