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The mystery of color-changing glasses is in the glass. This special glass is called "photochromic" glass. In the manufacturing process, it is pre-doped with light-sensitive substances, such as silver chloride, silver bromide (collectively referred to as silver halide), etc., as well as a small amount of copper oxide catalyst. The spectacle lenses change from no color to light gray and dark brown, and then from black glasses to sound-tone glasses, all of which are magic of silver halide.” In the glass of color-changing glasses, there is a change very similar to the exposure image of photosensitive film. Process. Silver halide is decomposed by light and becomes many black silver particles, which are evenly distributed in the glass, so the glass lens appears dim and blocks the passage of light, which is black glasses. However, it is different from the situation on photosensitive film. , the silver atoms and halogen atoms generated by the decomposition of silver halide are still closely together. When returning to a slightly darker place, under the promotion of copper oxide catalyst, silver and halogen recombine to form silver halide, glass lens became transparent again.