Once the liquid cools down to 32°C/89.6°F the image will go away and once again become just black.
The Heat Activated Funny Mug is a top notch coffee cup! If you're looking for something with a good laugh factor, this mug won't disappoint – pour in some hot liquid and be surprised as an awesome design appears right before your eyes! It comes with foam packaging included so it's ready to gift, plus its high grade ceramic construction ensures that it's built to last - perfect if you're looking for something long term, or just want your mug to stay warm longer too. Plus, there's a 100% satisfaction guarantee here so no questions asked money back if anything goes south with your purchase of course!
All in all, I can highly recommend the Heat Activated Funny Mug - great quality with unbeatable humor value! Just make sure you not only hand wash it (it's not safe for dishwashers or microwaves), but also ensure that the hot beverage poured inside is at least 70°C / 158°F if you wanna see those colors shine - cold temperatures won't work so well here folks.