Ash
Waste product of fire; the end product of incomplete combustion; the solid remains of fires; specifically, it refers to all non-aqueous, non-gaseous residues that remain after something is burned
                        more on  Wikipedia 
                    
Waste product of fire; the end product of incomplete combustion; the solid remains of fires; specifically, it refers to all non-aqueous, non-gaseous residues that remain after something is burned
                        more on  Wikipedia