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In daily life I is to use a band-aid don't know when to replace, in order to solve this problem by testing the body pH level change to improvement of band-aid, healthy skin and has healing the wounds of the pH usually under 5. Once appear disease syndrome or bacterial infection, wound by acidic to alkaline, pH value of 6.5-8.5: band-aid indicator will be changed from colorless to red color, red smiling face will show band-aid is apparent in the end of life, in order to remind everyone to replace new band-aid.
Art & Design college