When oil paint replaced tempera in the fifteenth century, it helped painters to deal with difficult subjects like the human figure because, unlike tempera, oil can be blended and overpainted.
油画颜料在十五世纪取代蛋彩的时候, 画家开始能够处理一些诸如人像画等困难的题材, 因为不象蛋彩,油画颜料可以混合和覆盖.