BJORN RORSLETT / SCIENCE PHOTO LIBRARY BJORN RORSLETT / SCIENCE PHOTO LIBRARY
Evening primrose in UV light. Photograph of an evening primrose (Oenothera biennis) flower coloured to show areas that reflect (white) or absorb (red) ultraviolet (UV) light. The bull's- eye pattern, known as a 'nectar guide', is thought to help attract pollinating insects, which can see in UV light. This image was taken on a digital camera adapted to filter and detect UV light. The resulting monochrome image was coloured on a computer. UV light is invisible to humans and does not have a true colour. See image B828/589 for normal daylight version.
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