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Color change of aluminum lunch box after use.
It should be that the aluminum lunch box with high water temperature is oxidized, and it will turn black when rubbed with paper.

There's nothing wrong with it. If you feel uncomfortable, you can change to an iron or plastic lunch box ~ ~ Decorate other dishes with aluminum lunch boxes, just don't throw them away. No, according to the production principle of Yahong aluminum foil lunch box, after four processes of protective coating, high-resolution flexible UV printing layer, aluminum material, anti-corrosion protective layer and sealing layer, it has aluminum foil surface coating treatment and high-temperature disinfection and decontamination treatment technology, and it has Wenzhou resistance itself. It won't fade at all because of high temperature. No, according to the production principle of Yahong aluminum foil lunch box, after four processes of protective coating, high-resolution flexible UV printing layer, aluminum material, anti-corrosion protective layer and sealing layer, it has aluminum foil surface coating treatment and high-temperature disinfection and decontamination treatment technology, and it has Wenzhou resistance itself. It won't fade at all because of high temperature.