Soot

Soot is a mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons. Soot is considered a hazardous substance with carcinogenic properties. Most broadly, the term includes all the particulate matter produced by this process, including black carbon and residual pyrolysed fuel particles such as coal, cenospheres, charred wood, and petroleum coke classified as cokes or char.

It can include polycyclic aromatic hydrocarbons and heavy metals like mercury.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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