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Life Cycle in Color (Posted on 2003-02-05)

It's black when it's not in use, it's red when it's in use, and it's grey when you're done using it. What can this be??

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Rating: 2.7857 (14 votes)

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Answer

| Comment 5 of 29 |

I guess there are lots of answers to this. I'm almost 100% sure charcoal and coal are correct. You could also say that the inside of a cigarette has these properties.

Posted by Alan on 2003-02-06 13:10:15

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