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Dark side of the rainbow

Christopher Crockett’s “When a rainbow goes full circle” (SN: 11/1/14, p. 32) showcased a spectacular photo of a double rainbow snapped from a helicopter over Western Australia.

Sharp-eyed readers were quick to point out an interesting optical phenomenon in the image. “Not only does it show the full-circle double rainbow, the viewer can also discern that the outer bow has the spectrum colors reversed,” wrote Jean Parcher.