Related Clues:

• Archaeological fragment
• Red river
• Rock on a roll?
• Volcano feature
• Leftovers at a barbecue
• Hearth particles
• Andiron residue
• Mount St. Helens residue
• Kindling, eventually
• Word with can or Wednesday
• Forest fire obscurer
• Bonfire result
• Volcanic discharge
• Grill waste
• Soap containing volcanic pumice