Create awareness and help minimise the chance of burns and spillages of hot drinks. Smart Lids turn bright red with heat and change back to the dark color as your drink cools. A visual indicator that your drink may be hot. Approved for direct food contact.
via Packaging of the World – Creative Package Design Gallery http://feedproxy.google.com/~r/packagingsoftheworld/~3/_S2P52AxD7A/smart-lids.html