Never Burn Your Tongue Again! It always happens when you least expect it – you take a drink of your morning coffee and before you know it, it’s too hot… and too late. The Drinking Timing glass by Hsu Sean is a thoughtful design that uses thermo-chromic material to provide a visual indication of the temperature. Too hot and it will glow bright red, too cold and it will be clear. Remember your shade and you’ll have the perfect temperature each time!