What is the writing cloth for practicing writing brush?

Water-writing cloth is a special kind of cloth, which uses water instead of ink for wool training. The writing cloth turns black immediately, and then turns back to its original color when the water dries. Therefore, durable brush calligraphy cloth stickers can replace ink with water and paper with cloth, also known as ten thousand times water book cloth, ink-free book cloth and so on. It is characterized in that when the brush is dipped in clean water to write, the effect of writing with ink on rice paper can be shown on the cloth, and a new cloth will be restored after the water is dried.