lampblack
lamp.black \-.blak\ n : a fine bulky dull-black soot deposited in incomplete combustion of carbo naceous materials and used chiefly as a pigment (as in paints, enamels, printing inks)
Webster's English Dictionarylamp.black \-.blak\ n : a fine bulky dull-black soot deposited in incomplete combustion of carbo naceous materials and used chiefly as a pigment (as in paints, enamels, printing inks)