Color-Changing Markers Let You Know When a Hot Drink Has Safely Cooled
The markers used by baristas at coffee shop class to judge cup might soon be useful for more than just key out your boozing . enliven by the experience of burn your tongue on excessively hot coffee , theInk N Drink markerscontain heat - sensitive ink that let you screw which drink is yours , and if it ’s good to sip yet . The marking write in blue ink , but when it ’s exposed to temperatures exceeding 150 degree Fahrenheit — like from a live drink inside a theme cup — it change to special K , let you know your boozing is too hot ....