How many kinds of blue color cards are there?

1, blue: it belongs to light blue, with more emphasis on emerald, just like the color of jade.

2, blue: bright blue, often used to describe mountains, smoke, the sky and so on.

3. cyan: cyan should be a color between green and blue, that is, blue-green or green-blue.

4, blue: one of the three primary colors, it is the coldest color, blue is very pure, usually reminiscent of the ocean, sky, water, the universe.

5. Indigo: the blue dye obtained by soaking the leaves of Polygonum cuspidatum in water and precipitating with lime is blue-green.

6. Indigo: Also known as "Indigo", it is a blue dye extracted from Indigo or Isatis indigotica.

7. Blue: China traditional color terms, deep blue and cyan.

8. Blue: The color of clear sky is fresh, open and comfortable.

9. Sapphire: a color dyed with indigo, bright and bright blue.

Extended data:

Blue is a symbol of eternity. There are many kinds of blue, and each blue represents different politics or other meaning. There are also many examples of music, books and stars named in blue.

Because air molecules and dust in the air scatter sunlight in Rayleigh way (the scattering intensity is proportional to the fourth power of frequency), they scatter more high-frequency light (green, blue and purple light) than low-frequency light (red, orange and yellow light), so the clear sky is blue. Because seawater absorbs more low-frequency light (red, orange and yellow) than high-frequency light (green, blue and purple), seawater will appear blue to some extent.