What is the difference between blue and indigo?

Related questions

1. How do you tell if a color is warm or cool?
2. Is Indigo darker than violet?
3. Is Brown a warm color?
4. What Colour is indigo in rainbow?
5. Is Indigo its own color?
6. Is indigo and violet the same color?
7. Is GREY a cool color?
8. What color is indigo in a rainbow?
9. Where does the color indigo come from?
10. What is the true color of indigo?

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1. #violet
2. #light
3. #always
4. #indigo
5. #spectrum
6. #originally
7. #color
8. #because
9. #really
10. #jeans
11. #standard
12. #people
13. #technically