1. Rinse the stain with running water first to remove the floating color on the stain.
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2. Rinse the flour with boiling water, let it cool, soak the stain in the flour solution for 10-20 minutes, and remove.
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3. Then rub the stain with cooked rice, during the rubbing process, the rice will absorb the charcoal contained in the ink, with this method, it should be able to remove 90% of the stain.
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4. After stain treatment, if the stain residue is still obvious, bleach can be used. If sodium hypochlorite bleach is used, it should be prepared into sodium hypochlorite solution with a temperature not exceeding 60℃ and a concentration not exceeding 1%, and only the stain part should be partially bleached. If hydrogen peroxide is used, the stain can be wiped directly with dichloride water. Removal of red ink stains The newly stained red ink stains can be washed first, and then soaked in warm soap, until the color stains are removed, and then beautifully washed with water. Red ink stains with longer pollution time should be washed first, and then wiped with 10% alcohol aqueous solution. Removal of blue ink stains Newly stained blue ink stains can be washed with soap, laundry detergent and other detergents. Blue ink stains with longer pollution time can be rubbed after oxalic acid solution immersion, and then cleaned with detergent