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Pour boiling water into the thermos and pour it out later. What are the tiny flickering fragments? Is it harmful to human body? Did it just boil?
That's actually silicon dioxide. The main components of glass in thermos bottles are silicon dioxide, calcium and magnesium. When the PH value of water is higher than 8.7, it is easy to precipitate. This is non-toxic and harmless. See Zhejiang Minsheng Channel-18 18 golden eye for details.

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