Japanese scientist development goes environmental protection of a kind of reproducible glass, " of glass of zoology of this kind of new-style " does not contain harmful to the environment halide. The halide that contains chloric, bromic, iodine to wait is the important raw material of production glass. Because among them halogenate is silver-colored,glass pales is (like silver iodide) in sun's rays ultraviolet illuminate falls, be united in wedlock with silver-colored ion, form cause of neuter metallic silver-colored atomic. These silver-colored atom gather together to make glass pales. And haloid react with organic carbon element, can form the poisonous compound that cause cancer. The researcher of institute of advanced science and technology uses Osaka country nitric acid salt is replaced haloid, result discovery, below ultraviolet illuminate, the transparent glass that contains nitric acid silver became yellow. If heat maize glass to maintain 15 minutes to 500 ℃ again, it becomes transparent again, and this one color changes a process to be able to relapse for many times.
