Ultraviolet photo of a Trifolium repens (White Clover; Dutch Clover) flower head. The head contains fresh flowers at the top, while older, dead flowers droop towards the bottom of the flower head.
In visible light the flowers are quite bright, with a slight cream colour. In ultraviolet on the other hand, the flowers appear quite dark.
Piece of bright grass near bottom right removed in ACR
Colours modified in PS CC