过去,许多专家认为敦煌壁画变色是因为作画时所使用的铅粉氧化从而导致壁画变色。但新的科学分析表明,在敦煌壁画的人物肤色及近似色彩中,并没有使用铅粉。 In the past, many experts believed that the discoloration of Dunhuang murals was due to the oxidation of lead powder used in painting, which caused discoloration of the murals. However, new scientific analysis shows that lead powder is not used in the color and approximate color of characters in Dunhuang murals.