Sooty means blackened with the fine powder that smoke leaves behind. Fingers after handling a grate.
Soot is the black residue of incomplete burning, and it gets everywhere in a house with an open fire. The adjective describes anything marked by it — a sooty chimney, sooty hands, sooty rain in an industrial city. It also describes a colour, so a sooty black bird is very dark indeed. Chimney sweeps are the trade the word belongs to, and a sooty face is the standard picture of one.
1adjectivesootyCovered in or resembling soot.
“His hands were sooty from clearing out the grate.”
Middle English
sooty
English, today
sooty
From Middle English sooty, soty, equivalent to soot + -y. Probably influenced by similar Middle English suti (“dirty, filthy”), derived from the same root as Old English besūtian (“to befoul”).
Etymology from Wiktionary, CC BY-SA