White . . . .

 . . . on white.
Gracious me - who knew there were so many different whites?
The dried flower is white, but when put in a white box on a white piece of card the variations are visible! The flower is definitely not 'pure' white, but it will have to do for today's challenge.  
The alternative is in extras and is even less white as the strands of the seed head are quite dark!