Half a croissant, on a plate, with a sign in front of it saying '50c'
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Hot-or-Not Coffee cup.

Heat indicator strip for takeaway coffee cups.
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Takeaway coffee cups sometimes have a warning on the side "Caution: Contents hot". But it continues to say that, even after your coffee has been cooling for an hour.

Why not paint a warning on the side of the cup in thermochromatic ink so that it only appears when the cup is ACTUALLY hot?

EDIT: As someone else noted, googling "Hot or Not" may bring up some NSFW matches. Note: This is similar to the Coffee Cup of Shame, but I think that was intended to be more of a time-based thing.

There are also ceramic mugs like this, but I don't think anyone's suggested a strip on a disposable paper cup before.

Irrevenant, Aug 13 2008

the innovators http://findarticles...200411/ai_n24082166
many uses [4whom, Aug 13 2008]

one of the end-users http://www.bizcommu.../196/173/19658.html
hot-or-not, try not google that phrase at work... [4whom, Aug 13 2008]

MyStarbucksIdea http://mystarbucksi...e.com/home/home.jsp
Suggest ways for Starbucks to improve [acemcbuller, Aug 13 2008]

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       Baked, at least, by pizza delivery companies. See links
4whom, Aug 13 2008
  
      
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