Ya gotta look closer, but the colors of the secondary rainbow appear in reverse order.

The Primary is the lower one (and brighter) appearing L - R as red, orange, yellow, green, blue, indigo and violet, and the secondary (being much lighter) appearing as violet, indigo, blue, green, yellow, orange and red.

Interesting how that works!

And yes, I remeber Roy G Biv from, well... from too long ago to remeber!