I know this isn't really what this is about, but don't use parchment to make buttercream flowers on!! I was out of wax paper one day and made about 28 buttercream poinsettias on parchment paper.(i put little squares of it on my flower nail then laid them all out) Well, a few hours later I figured they were dry enough to apply to make cake. Wrong, they actually absorb into the parchment, so I couldnt get them off.
I was soooo upset. I found a way to make about half of them work but they definitely didn't look great. Just thought I'd share so no one else makes that mistake. They are definitely not always interchangeable, they have some very different qualities!!!