Thank you Kevin
I'm looking for desert instead of desert ghost..although they look similar to me.. lol
As my understanding, the frustratd truth is like what you said, almost all BP darkened when they aged.
But I was told that some genes are exception..such like banana, albino, super orange dream and desert.
That's why I'm looking for desert bee(I don't breed so fertile or not is not important to me at all).
But I cannot find any grown desert bee photos to make sure of this thought..