UV reactive ink is a special type of ink that changes color or becomes visible when exposed to ultraviolet (UV) light. This ink is often used in various applications, including printing, art, and security features. It can create vibrant designs that are not visible under normal lighting conditions, making it popular for creative projects and unique effects. When the UV light shines on the printed material, the ink reacts by fluorescing, revealing hidden patterns or colors. This property makes UV reactive ink useful for items like posters, t-shirts, and even banknotes, where added security or visual interest is desired.