Why do heat sensitive mug not work any more?

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Offline thedoc

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Why do heat sensitive mug not work any more?
« on: 19/12/2014 16:30:01 »
Teresa Jill Gos asked the Naked Scientists:
   
I read your answer on  how heat-sensitive mugs work and understand the concept.  What I don't
understand, though, is why my mug no longer works.

What do you think?
« Last Edit: 19/12/2014 16:30:01 by _system »

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Offline evan_au

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Re: Why do heat sensitive mug not work any more?
« Reply #1 on: 19/12/2014 21:09:40 »
If the mug coating has organic chemicals, they can degrade over time, when exposed to heat, oxygen and water...just the type of environment you would expect for a mug.