Colorful exhaust smoke is an obvious example of something wrong with your engine. It is critical because, unlike other issues, exhaust smoke is linked directly to the car's engine.

Massive clouds of non-toxic smoke erupted over Golden Gate Park's Music Concourse Saturday evening, sending plumes of color high into the sky that wafted as far as the Ferris wheel. The huge ...

Particles like smoke deflect and change the wavelength of the light from the setting sun. Extra changes like this provide more colors, resulting in a very vibrant sky.

PICATINNY ARSENAL, N.J. (Army News Service, May 3, 2007) - Soldiers on the battlefield use colored smoke in a variety of ways - to identify landing zones, friendly troops, potential targets and to ...