Cleaning preparation: lemon, knife, washing liquid and water.
Step 1: Cut the lemon with a knife (for the convenience of squeezing out lemonade).
Step 2: Squeeze the lemon by hand, so that the lemon juice drops to the peeled and colored part of the hand (the citric acid in the lemon can neutralize the alkaloids in the juice of the new walnut).
Step 3: Then peel off the new walnuts from your hands and squeeze a proper amount of washing liquid on the stained parts of your hands (the washing liquid has strong acid properties and can neutralize and remove alkaloids from the juice of the new walnuts).
Step 4: Then carefully knead and peel the new walnuts with your hands, and dye the colored parts on your hands.
Step 5: Wash the dirt and detergent residue on your hands with clear water.
Step 6: Peel the new walnut, and the color of the hand has been solved.