soot 
/ˈsʊt/ noun
/ˈsʊt/ noun [noncount] : a black powder that is formed when something (such as wood or coal) is burned
— sooty /ˈsu:ti/ adjective, soot·i·er; soot·i·est
▪ the worker's sooty hands
/ˈsu:ti/ adjective, soot·i·er; soot·i·est ▪ the worker's sooty hands
