Special Ink Developed for Camouflage Technologies and Wearable Electronics Printable Metamaterial: A liquid metal-based ink could help develop flexible invisibility cloaks in the future. It can be printed onto various materials, remains soft, and can be stretched to 120 times its original dimensions—while still maintaining its electrical conductivity and stability. Surfaces printed with this ink can redirect electromagnetic waves. This could, for example, make robots invisibl