Rainbow at Skien, Telemark, Norway ~ Imaged by Jan Thore Ovrum. The close-up shows the spectral colours. Towards the blue and violet the hues become less saturated because they are overlapped by lower intensities of all the colours redwards. Below we see the full primary and reversed colour secondary. Between them is the 'no-light' zone of Alexander's Dark Band.  There are supernumeraries and spokes enliven the sky inside the primary.   ©Jan Thore Ovrumk

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