in order for costumers to enjoy coffee at its best, it must be brewed and served at a high temperature. on the other hand consumer research reveals that people often prefer to wait for their beverage to cool down before sipping, to avoid the risk of scald burns. creating a coffee cup that warns you to be extra careful when taking a sip, when your coffee is most likely still too hot for you. the coffee cup changes its design due to the use of a temperature sensitive paint that is &lsquotriggered&rsquo by temperatures above 70°c. source httpwww.packagingoftheworld.com201402ddsmartcupconcept.html