Simple bracelet tells sunbathers when it's time to get in shade

Published on Tuesday 14 April 2009 22:03

SUNBATHERS could soon get advanced warning that they are in danger of burning, thanks to a new device developed by Scottish scientists.

A wristband made of specially treated paper that reacts to ultraviolet rays tells wearers they are at risk of sunburn by turning from yellow to pink.

Its sensitivity means it is able to give an alert well before sunburn becomes apparent on the skin, which can take between four and eight hours, by which point it is too late to prevent the damage.

In the UK, more than 70,000 people develop skin cancer annually, of which 9,000 are malignant melanomas, resulting in 2,000 deaths a year.

Professor Andrew Mills, who led the team behind the wristband, said: "Skin cancer is a huge health problem in the UK and many other countries, and sunburn is behind it in many cases.

"This device is a straightforward means for people to keep themselves safe while they enjoy the sun. It can also be modified and adapted for use with all skin types, which can react differently to ultraviolet light."

The indicator works by using an acid-release agent that absorbs ultraviolet light and a dye that responds to acidity levels in the indicator.

As the agent is decomposed by sunlight, it raises the pH level of the paper, changing its colour. Different agents could be used to make the device fit for various skin types. The device will now undergo trials with a view to selling it commercially.

Dr Julie Sharp, the science information manager at Cancer Research UK, welcomed the development. She said: "Anything that highlights the damage caused by UV exposure and encourages people to protect themselves could be useful, but it would need thorough testing to ensure it reflects sun exposure in real-life situations.

"Some people are more prone to skin cancer, and people with fair skin need to take more care in the sun," she went on.

"The best way to reduce your risk of skin cancer is to ensure that you don't burn. We can all enjoy the sun safely by spending time in the shade in the middle of the day, wearing a hat and sunglasses and using factor-15 sunscreen."

Last week, figures were released that showed 3.12 million people in the UK – 8 per cent of the population – used sunbeds every year, despite repeated health warnings about the risks associated with them.

Experts fear that, as a result, within the next ten years, the incidence of skin cancer could outstrip both lung and bowel cancer – making it the biggest cancer killer in Britain.