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Chapter 1195: The Village Surgery
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... n advance, then let it dry, so from the outside, it looks no different from ordinary yellow paper. The reason they used tea to spray is because the tannins in the tea react with ferrous ions in green vitriol to quickly produce ferric tannate, which oxidizes to turn blue-black. This is the secret of revealing the hidden image; anyone who has attended a chemistry class would understand this principle."
As the former literature champion, plus two years at the Medical University.
Suc ...
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