《文心雕龙·物色》
可见凡是描绘各种色彩的字，适当应用，方觉可贵；如果青的、黄的层见迭出，那就过于繁杂，不足为奇了。
凡攡表五色，贵在时见，若青黄屡出，则繁而不珍。
It can be seen that it is valuable to use the words that describe various colors appropriately; if the blue and yellow are repeated, it will be too complicated and not surprising.