An important step in this painting process is adding fine white lines between the different strong colors-red, yellow, blue, green and gold-to make them appear more harmonious and less gaudy.
為求圖案顏色不至於太過生豔，上色講究「韻法」，也就是在色與色之間還要加上細細的白色線條，讓紅黃藍綠金這樣強烈的五色顯得協調，稱為「退暈」。