Indigo: Explained For most of us, the first time we would have learned about indigo would have been in school, when we were taught color theory and the acronym for the colors of the rainbow: ROYGBIV.

In a thirty- year period, indigo planters doubled their profits every three to four years, and on the eve of the American Revolution, when cubes of indigo replaced paper currency, South Carolina ...

'The only reason Newton came up with 'indigo' is because for occult reasons he believed there must be seven basic colours that come together to make white' By Postmedia News Published Feb 16, 2015 ...