And in more somber news, I have recently learned of the passing of Indigo, that ethereal color of the spectrum quietly nestled between Blue and Violet. Even more shocking is that the color apparently never existed at all. The Standards Site contends that most people cannot distinguish indigo in the spectrum, and it is thought that Newton included this because of his belief in the mystical significance of the number seven. Geez, I always thought that I could see it, a very faint whisper of a line in that space between, well, you know. Even if I wanted to argue, it seems the tide has turned, this time in a pdf report:
As an aside, "indigo" turns out to have been inserted in the spectrum by Isaac Newton to fit a false analogy: He thought the colors in the spectrum corresponded to the notes in a musical scale. Although he initially reported only five colors (red, yellow, green, blue, and purple), he added orange and split "purple" into indigo and violet to get seven, like the seven notes in a scale. This is explained ChemMatters October 1998 Copyright American Chemical Society in a lecture on atmospheric optics given to the British Astronomical Association by E. L. Hawke and published in its journal (vol. 54, p.89, 1944).
Now what will become of Roy's last name? Everyone I knew remembered the spectrum with Roy. G. Biv. Now is it Mr. Bv? What the hell is that? OK, I thought everyone learned about Roy. Well, not everyone. Mention ROYGBIV to someone raised in India and they probably won't know what you are talking about. I am guessing that Roy is not a common name there. Schools there teach it as VIBGYOR. Looks like they will also be in a pickle.
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