Fresh walnut skin to get black hands is due to the reason that it contains "walnut pippin".

Walnut pellitory: the treatment of dermatitis of Chinese medicine ingredients, extracted from walnut green skin, containing tannin (i.e., tannic acid) and gallic acid and other substances, oxidized black, the most suitable for use in the hair dye coloring agent.

At present, the black color can be removed quickly after oxidation and discoloration, only diluted strong acid can be achieved, such as dilute sulfuric acid.

If the skin is contaminated with black oxides of walnut green peppermint, can only be frequent hand washing, relying on the body's own skin epidermal cells of their own metabolism, aging, shedding and slow removal.

Newly stained juice, can be sprinkled with some salt, gently moistened with water, and then immersed in soapy water to wash. For minor fruit stains can be washed with cold water, a wash is not clean, wash again, wash until clean. Heavier pollution,

Available dilute ammonia (1 part of ammonia 20 parts of water) and organic acids in the juice, and then wash with soap. Tweed clothes can be washed with tartaric acid solution. Silk can be used citric acid or soap, alcohol solution to scrub.

Drop a few drops of vinegar on the juice stains, rub your hands a few times, and then wash with water.