I noticed that all my rose nails have become discolored - I rarely use them for roses, just as heating cores! Are they ok? Is there a way to clean them? I even bought a new one recently but it discolored also. I use the homemade pan grease if that makes any difference.

Mine are like that too. I've noticed that some cookie sheets look like that after they've been used for a while (I just call them seasoned ) Maybe flower nails are made out of the same stuff as the cheaper cookie sheets?

what's a heating core?

nevermind!! I read a post a little farther down!!

Mine have turned different colors as well. It doesn't bother me though.

Good to know it's normal! Seasoned - I like that!
thanks all!