Ultraviolet photo of a Helleborus niger flower. The flower here is both backlit and frontlit, though the backlighting contributes little to the brightness of the flower. While the sepals are partially translucent in visible light (and more so in infrared), they appear to be relatively opaque in ultraviolet.
The sepals also appear darker in ultraviolet (when compared to the rest of the plant) than they do in visible light.
The plant is commonly known in English as the Christmas rose, and flowers from mid-winter to early spring. In visible light the flowers are white, gradually turning a green color as they age.
RAW processed through ACR, modifying white balance
Background set to pure white using combination of curves and white color fill layer in PS CC
Contrast increased slightly using Curves adjustment in PS CC