Sunglasses warning sunscreen

A paper wrist band can help prevent overexposure to sunlight and reduce the risk of cancer.

Researchers at the University of Strathclyde will help people know when they are exposed to certain levels of UV radiation by changing colors.

According to the Daily Mail, paper rings work by turning color from gold to pink when the strength of UV radiation increases. It works thanks to an acid-releasing substance that is capable of receiving ultraviolet light and a dye that reacts to the levels of pH in the indicator. The substance decomposes under the sunlight, resulting in rapid changes in color.

The rings will be made to suit different skin types, corresponding to different degrees of tolerance of people in front of sunlight. For example, a gold-plated paper band for blonde and light-skinned people will change color faster than people with darker skin and dark hair.

Exposure to sunlight can increase the risk of skin cancer, including the most dangerous, fatal form of melanoma. British statistics show that in 2008, there were 200,000 new cases of malignant melanoma worldwide.

Sunblock warning cuffs are expected to become useful devices, helping people to know when to stop sun exposure. The technology is expected to be launched by Intellego Technologies, Sweden, in the spring of next year.