Are you one of those people who never know what to buy for a friend when holidays approach? If you said yes I might have found something very cool for you.

It’s an ordinary mug you’ll say. But is it really?

When empty this mug is black with OFF written in white. But as soon as you put something hot in, it changes color and is turning white with big black ON. Coated with heat sensitive pigment it changes color within seconds.

Guess what I’m buying next.

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