Spotted orchid in UV light. Spotted orchid flowers (Dactylorhiza maculata) coloured to show areas that reflect ultraviolet (UV) light (light areas) or absorb UV light (dark and red areas). The UV 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 image is monochrome since UV light has no true colour. See image B806/1449 for normal daylight version.