Instantly turning a material from opaque to transparent, or from a conductor to an insulator, is no longer the stuff of ...

Glare-free windows could be made from a material studded with billions of tiny metal patches. This makes a one-way window that is matte – it looks opaque, reflecting barely 1 per cent of light ...

Opaque close opaqueA material, object or substance which does not allow light to pass through it. materials are substances which light cannot pass through, like stone, metal or wood. Luminous ...