DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of Soot (carbon) particles from the inside of a wood burning chimney. Soot, also known lampblack or carbon black, is a dark powdery deposit composed mainly of amorphous carbon. Soot accumulates as a deposit from unburned organic fuel residues. It is a major component of smoke from the combustion of carbon-based organic fuels. Soot is considered an airborne particulate and thus is considered hazardous to the lungs and general health. Soot particles can be less than five micrometres in diameter and are not filtered out by the upper respiratory tract. Smoke from diesel engines, while composed mostly of carbon soot, is considered especially dangerous due to its particulate size and the many other chemical compounds present. Soot has been used for many years as a common pigment in paints, inks, and printer toners. Soot is theorized to be the second-largest cause of global warming. Magnification: x160 when.
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