We proposes to use the Materials Science in cosmetics to create products for the skin, nails and hair capable of transforming the surface of the body into an interactive platform. This is the innovative challenge of Hydraink and our "skin interfaces" technologies: we want to rethink the make-up from a simple body coloring process to a range of dynamic and interactive colors for every moment of the day. Hydraink is a makeup system that changes color and allows to change our appearance in according to the dress we wear, the time, place and the professional and social context in which we find ourselves.