Competitive products reminding reapplication of sunscreen are often sticker and wristbands which are uncomfortable and easily fall off. Suncayr is a color changing marker that is applied directly on skin that delivers personalized knowledge of your skin’s protection. With Suncayr, the user can draw whatever they like on their skin before applying sunscreen over-top of the ink. The ink is UV responsive, meaning that when UV hits the ink, it changes color. After applying sunscreen again, the ink changes back to its colorless state. The color change is reversible, can last all day, leaves no tan line, and is removable at the end of the day. In addition, it can be applied anywhere you want (especially in areas that are easily burned, like on your shoulders), and is very water-resistant.