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Main - Craziness Domain 二番: Kuchi Kopi's Bar - Why is indigo part of the rainbow? (And discuss anything related to colors, too!)
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Squiddy
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Red, orange, yellow, green, blue, and purple/violet. Three primary colors and three secondary colors. But indigo, which is navy blue, is considered a color seperate from blue. So if indigo is part of the rainbow, why isn't pink or forest green part of the rainbow?

So what are your opinions on this matter?

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Gohan
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Every color in the world is part of the rainbow. Don't you pay attention to hexidecimal charts? :P

But the standard ROY G BIV rainbow, I guess, was catchy? Pink should be part of the rainbow though..

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I know every color is part of the rainbow but indigo in the standard rainbow seems to not fit since blue is already part of the standard rainbow.

I guess it was made for the ROY G BIV acronym.

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Posted by HolyRomanEmperorTatan
I know every color is part of the rainbow but indigo in the standard rainbow seems to not fit since blue is already part of the standard rainbow.

I guess it was made for the ROY G BIV acronym.
But I always thought that Indigo was more purple than blue. But then again, why would they add violet if they already had a purple?

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Isn't violet present when purple isn't and vice-versa?

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Why not cyan in the rainbow? (in fact, I believe some cultures/languages have cyan as part of the rainbow, I believe :D)


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Because obviously who named the colours of a rainbow was too lazy to list the various hues of the colours of light.


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Actually it's because Newton liked the number 7 and wanted there to be 7 colours.

It's possible that Newton's "blue" was really cyan and his "indigo" was really blue.

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Posted by Banedon
Actually it's because Newton liked the number 7 and wanted there to be 7 colours.

It's possible that Newton's "blue" was really cyan and his "indigo" was really blue.
But how does that work, I mean... Was Newton color blind?

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Well, cyan/light blue could have been mistaken for blue. Thus, blue became indigo.

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Also, re violet:

Violet and purple are different wavelengths of light (violet is beyond blue in the electromagnetic spectrum, whereas purple is a combination of blue and red light)...but due to a quirk of human vision, we see them as exactly the same.

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With that in mind, indigo may be a tetrochromatic color (A.K.A.: a color that we can neither see and imagine) so it appears blueish to us.

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Apparently some humans are tetrachromatic and can see a 4th fundamental colour besides red, green, and blue.

I wonder what that would look like to them.

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Posted by Banedon
Apparently some humans are tetrachromatic and can see a 4th fundamental colour besides red, green, and blue.

I wonder what that would look like to them.
I'm betting they see a lot more yellows. Those are the four right? Red, blue, green and yellow?



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I'm not sure. I think so. But do they see yellow the same way we do, or do they see it as some unimaginable colour?

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Posted by Banedon
I'm not sure. I think so. But do they see yellow the same way we do, or do they see it as some unimaginable colour?
Honestly, I was just going off the colors that they use for the special buttons on say, tivo remotes. (A, B,C and D buttons) I never really used those..


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Ah.

There does seem to be a common misconception that the primary colours are "red, yellow, and blue". What they really mean are magenta, yellow, and cyan, the primary colours of pigments (subtractive mixing; all colours together make black), and the ones seen in printer cartridges.

Light uses "additive mixing" (all colours together make white) and its primaries are red, green, and blue. I actually had a teacher who got this wrong.

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Posted by Banedon
I'm not sure. I think so. But do they see yellow the same way we do, or do they see it as some unimaginable colour?


I would not be surprised if they might be able to see infrared light and ultraviolet rays.

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Some species see infrared and/or ultraviolet, I'd be curious as to whether any mammals do? ;) (fun fact: you can use a digital camera to test remote controls, the infrared looks like a bright blue/purple :P)


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Posted by Dragon Goddess
Some species see infrared and/or ultraviolet, I'd be curious as to whether any mammals do? ;) (fun fact: you can use a digital camera to test remote controls, the infrared looks like a bright blue/purple :P)
But we have blue lights, which are pure inferred. Why would you need to use a camera to tell what color inferred is?
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