The blue almost seemed to melt a little bit, and after baking it stuck to the aluminum baking cups. When we pulled them out, the aluminum pan bottom had bits of blue on it, which we haven't been able to scrub off. We ended up cutting small parchment paper circles to place in the bottom of the baking pans so that the foil cups wouldn't stick, and that worked very well, but it would have been much better if we hadn't had to do that.
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