Water doodle mats, Magical Water Canvas is an innovative calligraphy and painting art product, which works based on the principles of physical optics, as follows:

1. Double layer structure: The water canvas has a double-layer structure, with the bottom layer being a base such as black rice paper, and the top layer uniformly covered with a porous and rough coating. This layer of coating appears white under normal circumstances, but due to its uneven surface and diffuse reflection, most of the light cannot enter the base layer, and black will not appear.

2. Transparent when in contact with water: When writing with a brush dipped in water, the water will evenly penetrate into the coating. Due to the loose and porous nature of the coating, moisture can make it transparent, revealing the underlying black color and creating a black handwriting effect. This phenomenon is based on the physical principle that light is refracted through water to the bottom color layer and absorbed.

3. Reusable: After the water evaporates, the paint returns to its original state, the handwriting disappears, and the canvas turns white again. It can be reused. This feature allows the water canvas to be reused, saving paper and ink, being clean and hygienic, while also being environmentally friendly and efficient.

These characteristics of water canvas make it an ideal choice for calligraphy enthusiasts and children’s graffiti, both economical and convenient to use, while reducing environmental pollution.