Engineers repurpose 19th-century photography technique to make stretchy, color-changing films

By applying a 19th-century color photography technique to modern holographic materials, an MIT team has printed large-scale images onto elastic materials that when stretched can transform their color, reflecting different wavelengths as the material is strained. Credit: Mathias Kolle et al Imagine stretching a piece of film to reveal a hidden message. Or checking an … Read more