The Smart Lid is a new innovation in disposable beverage lids that tells the consumer if the lid is on correctly and if the beverage is hot - it goes from brown to red when placed on, then cools to brown when the liquid becomes less hot. The bottom of the lid will stay brown if, and only if, the lid is on correctly.

Neat application. I’m still more for advocating innovation in the green area - with biodegradable products mostly - than for more plastic. But, it is innovative.