Related Clues:

• ThiS, e.g.
• Inky smear
• Blemish
• Bad mark
• Key blunder
• Window washer's mistake
• Fingerpaint
• Microscope sample
• Makeup problem
• Rorschach ink mark
• Sling mud at, politically
• Lipstick mishap
• Fingerpaint, for example
• Part of a Rorschach test
• Printing goof