It turned out that Chiu couldn't control the lines. He did, however, make a few key discoveries: ordinary asphalt used for roads wouldn't stick well to canvas; if the temperature was too high, it would melt and change shape; if it was too cold, it would crack and peel off. Chiu would have to improve upon these shortcomings if he wanted to paint with it.
結果線條的遊走都還拿捏不準，他就發現多項缺點：一般用來鋪路的柏油，除了在畫布上黏著力不夠外，溫度太高會融化、變形，溫度太低會龜裂、剝落，若想用柏油作畫，必得先改善這些缺點。