sooty sooty /ˈsuːti/

adjective

1. () Of the blackest black; similar to the color of jet or coal  ( jet , jet-black , pitchy , coal-black , sooty )
   of the blackest black; similar to the color of jet or coal
   
2. Covered with or as if with soot  ( sooty )
   covered with or as if with soot
    A sooty chimney
   a sooty chimney