Related Clues:

• Grate collection
• Spatter cone's output
• A smoker may flick it off
• Barbecue by-product
• Campout fallout
• Holy Wednesday forehead marker
• It buried Herculaneum
• Soap brand with pumice
• Butt remains
• Briquette residue
• Old flames?
• Common tree
• Dusty remnant
• Incinerator product
• Liquefied rock