I'm wondering because when you light tires on fire, the smoke is black.

UPDATE: According to our esteemed Drs. Science in the comments, the burnout tire smoke is not actually smoke. It's a vapor. Sortof a tire steam, if you will. It's not a full combustion such as the tire fire above, but a superheating of the rubber. So it vaporizes.

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Now we know. And knowing is half the battle. And battling is half the fun. Now I'm off to tell Matt Farah to change the title of his blog.