DermaTec?s alcohol detection patch is worn directly on the skin, much like nicotine patches worn by smokers. The difference is that, instead of releasing a product into your body, it changes colour depending on the amount of alcohol that has been drunk. From white to very dark blue, the patch moves through a range of shades of blue, allowing you to tell at a glance when you need to book a cab or get a lift with a friend. www.derma-tec.com
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