What was the name of blue in ancient times?

In ancient times, blue was called indigo, navy, azure and so on. , which is explained as follows:

1, indigo is indigo. Liquid made by soaking blue grass, also known as deep blue. Indigo, an organic dye dark blue, is fermented from leaves of plants containing indole acid, such as Polygonum cuspidatum, Isatis indigotica, Indigo edulis, Malaya and so on. Indigo is also synthetic (in ancient books, it is said that all five blues can be indigo-Song Ying Xing. Wu Kai in the Heavenly Palace). The color used to dye cloth can last for a long time. Known as indigo, some areas are called indigo.

2. Blue: China traditional color terms, deep blue and cyan. Source: Ye Shengtao's "Tour Three Lakes": "There are several thin clouds floating in the blue sky."

3. Blue: a kind of blue, which is used to describe the color similar to a clear sky. Tang Du Fu's poem "Going to Jin Huashan in Winter" has related records.

4, sapphire: the color of pure sapphire, bright and bright blue.

5. Indigo: China traditional color term, dark blue, which means "dark blue color, exquisite and beautiful.

Extended data

Among the three primary colors of red, green and blue, the blue with the shortest wavelength is 440 ~ 475N·nm, which belongs to short wavelength. Blue is a symbol of eternity. There are many kinds of blue, and each blue represents different politics or other meaning.

Symbolic significance of sky blue, lake blue and sapphire blue;

1, sky blue: the lightest blue in the sky blue, with almost no traces of red, just like the coldness of the sky. The color that represents the "initial" is the representative of the biological childhood (the mature color is green). Psychologically speaking, sky blue and pink are both "soothing colors", which are quiet and relaxed colors.

2. Lake blue: Lake blue is dark blue, but it has an escape light. It is as beautiful as a lake immersed in endless silence. It stands for "waiting". In the hint of color, it is the color of forbidden words. Usually in places full of this color, people talk less.

3. Sapphire Blue: In legend, the prototype of the goddess of hope is a blue diamond. Therefore, the jewel-like beautiful blue has become synonymous with "hope". Psychologically speaking, sapphire blue, like purple, will give people a noble feeling and attract people's attention. The picture on the right shows the famous sapphire ocean.

References:

Baidu Encyclopedia-Blue