Colored Smoke?

Someone told me that someone makes a tire that when you burn rubber the smoke that comes out and the "black" marks left on the road are colored, like blue or red etc. I was just wondering if anyone else has heard of these and if you have where can i get some?

Its probably referring to the BF Goodrich Scorcher T/A which has a colored line in the tread. Its a decent tire too, just expensive.