The asphalt itself creates many lines on its own, and these give the paintings a simple and unpretentious quality. No wonder Chiu has become so thoroughly enamored of asphalt. Interestingly, while we are used to seeing asphalt that is black due to its thickness, it turns into various shades of brown when diluted with solvent. Sometimes, Chiu adds pigment to give the asphalt "color."
有趣的是，平常我們看到的柏油因為較濃稠而呈黑色，若以溶劑稀釋，則成不同層次的咖啡色，有時為了搭配題材，邱錫勳還會以油彩為柏油上「色」。