Related Clues:

• Lampblack source
• Flue deposit
• Schmutz on Santa
• Flue substance
• Stainer of Santa's coat
• Component of Japanese sumi ink
• Burnt-coal residue
• Target of a sweep
• '58 world's fair site
• It's black in a stack
• Chimney stuff
• Capital of Belgium
• Toner ingredient
• It should cover Santa
• Some particulates