http://earthsky.org/earth/first-ever-im ... er-rainbow
it's visible as a faint green between the 2 main bows;Harald Edens’ discovery image was taken on August 8, 2012 from the Langmuir Laboratory for Atmospheric Research near the 10,800-foot summit of South Baldy Peak, New Mexico, USA. This is the first-ever image on which the 5th order rainbow is positively identified. ...
pretty cool, I didn't know this was possible even!
Mark j