<..... classify different brands for particle size under a microscope. There may be differing moisture levels, too, which could be easy to determine by weighing, drying, ......>
It might pay to take the powdered sugar you buy, bake in an oven at around 150º for about 1/2 hour, cool, then run through a mortar/pestle operation to ensure that the sugar is in fine powdered form.
Mike in LA
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