Why isn't indigo considered a color of the visible spectrum anymore?

Subject: Why isn't indigo considered a color of the visible spectrum anymore?

Date: Wed Oct 11 21:46:53 2000
Posted by John Bicknell
Grade level: 10-12 School: Cave Spring High School
City: Roanoke State/Province: VA Country: United States
Area of science: Physics
ID: 971315213.Ph

Message:


Most Text books say that the colors of the visible spectrum (the rainbow) 
are Red, Orange, Yellow, Green, Blue, Indigo, and Violit.  However, I 
heard or saw somewhere about a year or two ago that Indigo wasn't 
considered a color of the visible spectrum.  I checked it up on Microsoft 
Encarta 99, and sure enough, it stated the colors excluding indigo and 
actually stated that indigo "...was formerly considered a color of the 
spectrum."  I was wondering why this is.

Re: Why isn't indigo considered a color of the visible spectrum anymore?

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