Scientists say they have made a vivid 3D printing ink without dyes and pigments

The biocompatible ink is safe for use in toys that change colour or even food decorations, though it’s not yet edible, according to Chinese team. New technology is based on structural colouration – meaning it produces colours through interactions between light and intrinsic nanostructures. — SCMP

Chinese scientists say they have developed a vivid 3D printing ink without colourants that is safe to use in toys that change colour in relation to body temperature, or even for food decorations.

The biocompatible ink could potentially be developed for wearable biosensors and bionic skins to monitor exercise through changing colours, according to the team.