| 21. | If their struggling caused a fall of soot they would suffocate.
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| 22. | Carbon black, instead of soot or ash, is used.
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| 23. | Coal and soot or carbon black are informally called amorphous carbon.
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| 24. | This also helped with reducing soot emissions of the earlier model.
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| 25. | The police find a length of rubber pipe stained with soot.
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| 26. | A new proposal uses a special soot made of carbon nanotubes.
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| 27. | With soot increasingly difficult to obtain, Castle began using color.
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| 28. | Carbon ( soot or ash ) is also used for black.
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| 29. | What would be the way to distinguish nanos from ordinary soot?
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| 30. | Not the same as soot from other sources such as wood.
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