A Japanese chemical company has successfully researched two kinds of food anti-theft packaging technology: one is the signal display, this package method is green when it is intact, once opened, it becomes red; the other is to put the small package of ferrous oxide into the package. At the same time, another oxygen indicating graphic symbol is installed in the transparent cover. Once opened, the oxygen-deficient environment in the packaging is destroyed, and the ferrous oxide becomes iron oxide, and the graphic mark changes color.
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