With 100,000 cases of skin cancer resulting from overexposure to ultraviolet light in Britain every year, the dangers of too much sun are well known. Dr David Hazafy, a scientist at Queen’s University Belfast, believes there is another problem: those afraid of getting skin cancer do not venture outside and deprive themselves of the vitamin D their body needs.
His solution is a simple and cheap piece of plastic which can be tied around the wrist and contains an ink which disappears when the user has been exposed to the recommended daily dose of sun for their skin tone.
