The Color Lineup Of The Rainbow Is Not Actually ROYGBIV
In fact, everyone is now skipping indigo altogether. Even the LGBT pride flag is only represented by 6 colors. So why was this shade of blue included in the first place?
Well, Sir Isaac Newton believed that the number 7 had a somewhat cosmic meaning, so he believed that 7 colors would have to be put together to make white, so he included indigo, which was a very popular color dye at the time.