As a newbie, would appreciate thoughts on foundation. I left a nuc outside last year with 4 frames of new foundation and it is now white, not yellow. How do you keep new unused foundation in good condition. I spent some time making new frames over winter so I have about 100 made up.
As long as it's clean and no moths or larvae it should be fine.
I have never had a problem with frames like that, sounds like it has dried out from the effects of the weather, might be a bit brittle but the bees will sort it.