The Ink N Drink Marker is a simple innovation aiming to optimize the coffee and tea drinking experience by offering high-level visual cues of your drink's temperature.

The marker offers a two-pronged function:

It writes dark blue on paper cups but when a hot drink exceeding 150F enters, it turns bright green.

As your drink cools to 150F, the ink reverts back from green to the original dark blue color.

How can you use it?

Like your drink's hot? As the ink fades to dark blue, start drinking up.

Like it cooler? Wait till it reverses back to blue completely.

Drink completely cold? Microwave and see the ink change color back from blue to green to have a baseline of how hot your drink is.