Sunscreen can be great protection against harmful ultraviolet rays–that is if you can remember to reapply it every couple of hours. Enter the Suncayr marker, a James Dyson Award-winning design that uses color-changing ink to remind us when to reapply sunscreen. The application process is easy: users draw any design using the marker on their skin before applying sunscreen over the area; after the sunscreen is rubbed or washed away, the ink will change color to let you know when its time to reapply.

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