2. If the book is absorbent paper contaminated with ink, you can cover the pages stained with ink on it, soak them with 20% hydrogen peroxide solution, and then put them on the absorbent paper of the pages. The absorbent paper has a heavy pressure, so that the ink disappears naturally after being dissolved in waterless ink lines by hydrogen peroxide.
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3, consent form, if there are wet traces, you can use alum solution. If there is rust, wipe it with oxalic acid or citric acid solution, then rinse the page with water and blot it with blotting paper.