Sunglasses change with heat

Eyewear company Italia Independent has introduced a colour-changing sunglass - the I-Thermic - that reacts when exposed to a temperature higher than 30°C.

The company pointed out that the process that provides the deposition involved an enzyme with coloured pigment that, when it reaches 30°C becomes transparent and reveals the colour or texture of the base. Examples are a black frame with a Union Jack design beneath or a black model with a camouflage pattern (below). Italia Independent described the process as gradual and forever reversible. This meant that the sunglasses would look different in relation to the physical state of the wearer, with the colour changing as the temperature changes with aerobic activity, jogging and trekking, particularly at the point of contact with the skin.