Smoke is an inevitable by-product of fires. We may think of it as simply a dark cloud, but smoke also contains finely dispensed liquids and gases. In fact, the most dangerous components of smoke are the invisible gases present during the fire.
After the fire, the gases disperse, but the smoke solids and liquids remain on exposed surfaces. These deposits are more accurately called "fire residues" than "smoke," because they are no longer the same as the heated cloud generated by the fire.
Fire residues vary in character...
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