Simple ideas are usually some of the best, and I think this simple heat sensitive, color changing, coffee mug fits the bill. The mug starts off black (or cold) and turns white when the mug is really hot. This coffee gadget is available for $25 here.
Simple ideas are usually some of the best, and I think this simple heat sensitive, color changing, coffee mug fits the bill. The mug starts off black (or cold) and turns white when the mug is really hot. This coffee gadget is available for $25 here.
NASA and ADOBE had color changing mugs back in the 80s…