Nickel contact with human skin will make the skin think there is an "imaginary enemy" invasion, and secrete a substance to resist, this will cause skin allergy, rash, itching and other skin problems
Test method for nickel resistance:
Use a cotton swab to dip an appropriate amount of the test agent mixture containing nickel, then rub the test object for 30 seconds. If the object contains nickel, the swab will appear red, if it does not, the color of the swab will not change.
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