There are two types of anti-fog sheets, one is a pure transparent color, and the other is photochromic. The principle of color change is that when there is no sunlight, it is transparent, and when there is sunlight, it automatically turns blue-black.
Available in color-changing and transparent colors
Anti-fog stickers consist of nano-materials that absorb moisture, providing overall fog resistance. Often referred to as physical anti-fog solutions, they inherently maintain their anti-fog properties. It's worth noting that 90% of anti-fog sheets available commercially are based on coatings. As these coatings can deteriorate over time, the effectiveness of the anti-fog feature will diminish with wear.