How about color-changing glasses?

Color-changing glasses-can effectively resist ultraviolet rays and strong light, and are new eye protection products for healthy eyesight. In many developed countries, color-changing glasses have long been recognized by consumers with strong health awareness because of their health, convenience and beauty. The customers of color-changing lenses in these countries are growing at a double-digit rate every year. In China, color-changing glasses have become the new face of retail stores. However, whether among ordinary consumers or in the industry, there are still many questions about the understanding of color-changing glasses, and the mystery of color-changing glasses lies in the lens. In the process of manufacturing lenses, photosensitive substances, such as silver chloride and Australian silver halide, etc. And a small amount of copper oxide catalyst. Glasses from colorless to light gray, dark brown, and then from black glasses back to ordinary glasses, are the magic of silver halide. "The change process of color-changing glass is very similar to the exposure imaging of photosensitive film. When silver halide is decomposed by light, it becomes many black silver particles, which are evenly distributed in the lens, so the lens appears dim and blocks the passage of light. These are black glasses. However, unlike the photo film, the silver atoms and halogen atoms produced by the decomposition of silver halide are still closely combined. When we return to a slightly dark place, with the promotion of copper oxide catalyst, silver and halogen recombine to form silver halide, and the lens becomes transparent again.