This is a different seedling from the same cross as the yellow rose I posted a short time ago. I was actually thinking about getting rid of this plant this year before it flowered because it was hit pretty bad with powdery mildew, and it took a very long time to get its first flower this year.
Last year, it flowered pale yellow like this:
The same flower from the back.
This year, the flower started to take on a pale pink edging.
The subtle edging gives it a little different look than it had last year.
It does fade a bit in strong sun, though.
It's interesting that the color has developed into something much more complicated year over year. I've noticed the same thing happen with different seedlings as well. It's not just the size of the flower, the petal count, or the form that changes - the color goes through some subtle changes in the second year as well.
Because it gets powdery mildew so badly, I'm still not sure if I'm going to keep this seedling. Still, this year the PNW has had a long, cold spring and summer and powdery mildew is all over the garden. To be honest, this seedling is in much better shape than are some of my established garden roses ('Louis XIV' and 'Baron Giraud de l'Ain,' to name a couple).
I will have to think about what to do with this one... :)