The only reason "indigo" was included on the rainbow was so there would be 7 colors to match the 7 notes on the Western musical scale.
The only reason "indigo" was included on the rainbow was so there would be 7 colors to match the 7 notes on the Western musical scale.
— UberFactsNG (@FactAlways) August 9, 2017
from Twitter https://twitter.com/FactAlways
August 09, 2017 at 09:50AM
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