Smart lid indicates temperature
An ingenious solution for the take-away coffee industry: a colour changing disposable beverage lid that indicates the temperature of the liquid inside and clearly indicates that the lid is securely in place. The "smart" lid alerts consumers that the contents are hot by changing from coffee brown to bright red in colour with the colour range designed to indicate the temperature, enabling regular customers to "read" the temperature of their coffee. It's a small but significant product upgrade, adding significant functionality to the old dumb coffee lid.
Source: smartlidsystems.comAdded: 8 June 2006