smutch
Soot stain left
A smutch is a smudge or sooty mark—a dark stain left by contact with something dirty.
To smutch is to make such a mark: The chimney sweep smutched the wallpaper with his sleeve.
The word is rare and old-fashioned, largely replaced by smudge.
Unbroken series
fingerprint · thumbprint · discoloration · blemish · blur · darkening · dirty mark
smear
Spread or defame
dirty · streak · besmirch · begrime · sully · defile · daub · wipe · transfer · spread
streak
Unbroken series
splotch · fingerprint · thumbprint · discoloration · blemish · blur · darkening · dirty mark
soot
Carbon from incomplete burning
charcoal · dirt · chimney soot · fireplace ash · lampblack · carbon · cinder
smutchcleanliness
Absence of dirt
spotlessness · purity · immaculateness · pristineness · shine