3 ms·

Is there any colour (by hue) not in the rainbow?

• cormullion 9y ago
  Pink is considered to be a color not in the rainbow. http://aschoonerofscience.com/science-communication/the-physics-of-pink-why-it-isnt-in-the-rainbow/ http://aschoonerofscience.com/science-communication/the-phys...
  • dpark 9y ago
    I’ve seen this before and am still bothered by the color name chosen. Is calling magenta “pink” a British (or Australian) thing maybe? Pink is a pale red. [1] Magenta isn’t pale red. Even the color wheel used here doesn’t label it pink. Where does this come from? But yes, it’s interesting to learn that there is no wavelength for magenta. [1] https://en.m.wikipedia.org/wiki/Pink https://en.m.wikipedia.org/wiki/Pink
    • Accacin 9y ago
      I think it's a British thing possibly, we have a children's nursery rhyme that includes the colour pink so that might be the reason as we just get used to calling it pink as a kid.
    • hexameterhomer 9y ago
      That wiki page says the Odyssey is written in approximately 800BCE. It looks more violet than pink to me.
• limbicsystem 9y ago
  I don't know about 'by hue' but almost all colors are not in the rainbow. The spectral locus is a line that runs around the edge of a 2D color space (technically 3D if you include luminance as well...). 7D if you are a mantis shrimp.
  • rlonstein 9y ago
    > 7D if you are a mantis shrimp. Don't be sure: * https://www.popsci.com/blog-network/ladybits/mantis-shrimp-vision-not-mindblowing-you%E2%80%99ve-been-told https://www.popsci.com/blog-network/ladybits/mantis-shrimp-v... * https://phys.org/news/2014-01-mantis-shrimp-vision-differently-video.html https://phys.org/news/2014-01-mantis-shrimp-vision-different... Though they do see polarization, which is a neat feature.
• Zaak 9y ago
  The pure purples are not in the rainbow because they are a mixture of red and blue, whereas the rainbow is made of single-frequency colors.