The present invention teaches an ultraviolet active wristband. The ultraviolet active wristband is made of the same materials as any wristband already in the market. However, the present wristband has the intriguing propriety of changing color reversibly from clear to any visible color (violet, blue, red, orange, yellow . . . ) when exposed to an ultraviolet source. The wavelength interval of the ultraviolet source is �250 nm-400 nm!. Therefore, it is also sensitive to the spectrum of ultraviolet sunlight that is �290 nm-400 nm!. The active chemical is a photochromic substance such as spiropyrans, spiroxazines.