Water writing cloth is a kind of calligraphy and painting art that uses a brush dipped in water to write on its surface, and black ink will appear immediately. After the water dries, it can be written again. It is used to practice calligraphy, calligraphy and painting, and children's graffiti drawings. supplies. Water-writing cloth is mainly made of cloth; it is made based on the principle that paint is transparent when exposed to water; black cloth is used as the medium, and a layer of environmentally friendly white paint treated with a special process is added to the surface. The paint is transparent when exposed to water. The main component of paint is silica, which is the main component of sand and the main raw material for making drinking glasses. Transparency when exposed to water is mainly due to the physical principle of light reflection. Water-writing cloth uses clear water to instantly display black ink, which has the same effect as writing with ink on rice paper, so it is favored by calligraphy enthusiasts. Many first-time users feel miraculous after using it, so it has the reputation of magical water writing cloth; at the same time, because it can be reused, many people call it: ten thousand times water writing cloth; and because the pens, inks, paper, and inkstones used in Chinese calligraphy It is known as the four treasures of the study, so water writing cloth is respectfully called: the new five treasures of the study, the fifth treasure of the study, and the new first treasure of the study. As a calligraphy practice supplies, water writing cloth has been used by everyone as high-end business gifts, VIP gifts, bank points gifts, cultural derivatives, corporate image gifts, and city gifts for family members, friends, and customers.