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Maybe you'll find you'd rather have not known what the ingredients are in
"confectioner's glaze" but I discovered it for sale in a Maid of
Scandinavia catalog that just came in the mail (I was shopping for pizelles
there). I called and they called back with the ingredients of the one they
sell. And its:

  refined wax-free bleached shellac, food grade

plus

  specially denatured alcohol formula 35-9.

I think it's probably gluten-free. But do you really want to eat it?

Linda Blanchard
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Midland TX