Sooty (adjective)

1. Covered in soot or a dark blackish substance.
2. Dark or black in color.

Origin:

From old english sōtig, from sōt ("soo.t")

Examples:

1. The chimneys in the old factory had turned the surrounding walls sooty.
2. The sooty marks on the ceiling showed that the fire had been burning for a while.
3. His hands were sooty from working on the car engine.
4. The sooty color of the feathers on the bird made it difficult to spot in the trees.
5. The sooty air made it hard for the workers to breath.