I don't have any trouble with my colors changing except like the Fl Red comes out a lot darker, but as it cools down the color come back to being right. Some other do that as well, but don't stay or change to another color like you had happen.

I use a full size oven for most of my baking and have a toaster oven if I am not doing many or if the time is different on some when doing several colors I put the lower heat items in the toaster oven.

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