What does the pale blue in the ancient text refer to?

Answer 1

In the ancient text,"Cang" referred to dark blue, as in "The sky is grey, is its color correct?" In ancient times, the word "blue" didn't mean color, but a kind of dyeing plant (namely indigo). However, people's perception of color was sometimes not uniform. The color concepts represented by "pale" and "blue" might be universal. With the development of the language, the word "blue" had more meanings in the modern context. For example,"green pines and cypresses, the green surpassing the blue", which meant that it was full of vigor, heroic, broad-minded, and outstanding.