What's the difference between calligraphy paper A 13 and a4?

Calligraphy paper A 13 is colored paper. The material of colored paper is not much different from the ordinary paper we usually use, but there are many patterns or other decorative patterns on the surface of colored paper, and the number of frames and rows of colored paper cannot be customized. A4 is plain paper, and the background color of plain paper is white. Generally speaking, it has 150 squares or 13 lines. Specifically, it is not much different from ordinary printing paper, and some ordinary paper is slightly soaked in oil. The main purpose of this is to prevent ink from spreading and enjoy writing.