Use 'sooty' to create a strong visual of black or grey dirtiness caused by smoke or fire. The once colourful mural was now just a sooty shadow on the wall.
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Negative Association
'Sooty' often implies neglect or poor maintenance, suggesting something should be cleaned. The old lamps were sooty, hinting they had not been lit in years.
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Environmental Context
In environmental discussions, 'sooty' can describe pollution, especially from coal or factories. The industrial area was covered in a sooty haze.