Outline black - structure black! The real bitumen - it is made for producing clear lines and sharp edges and more over, it stands for perfect valve sensibility because of the FLOWMASTER(TM) Valve System. 1 to 20cm lines are possible! It is a deeper, genuine bitumen. The precise fine valve adjustment let the output rate be almost two times bigger than usually. "All Season(TM)" - works at lowest temperatures and covers the Burner(TM) Chrom after few seconds. 600ml can.