Why would a designer use hydrochromic ink?

A designer would use hydrochromic ink to create interactive and visually engaging designs that change color or reveal hidden patterns when exposed to water. This unique feature can enhance user experience in products like packaging, textiles, or promotional materials, adding an element of surprise and interactivity. Additionally, hydrochromic ink can be used for functional purposes, such as indicating moisture levels or providing a visual cue in various applications. Overall, it offers creative possibilities that enhance both aesthetics and functionality.