I purchased what was supposed to be Hakuun (White Clouds), which to quote one site: "a color breakthrough in the Giant Darwin Hybrid class because it opens and stays glistening white." I figured I'd give it the benefit of the doubt, but the tulip I cut last week opened and stayed a yellow, fading only slightly until spent.

Clearly this is not Hakuun:

Any suggestions? Maybe Golden Apeldoorn?