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Hi,

Here a recipe for Gluten Free Icing Sugar.

1 cup granulated sugar
1/4 tsp cornstarch

Combine sugar and cornstarch.  Put in blender at high speed until sugar is
very fine (powdered).  Store in air tight container.
Use equal amounts of gluten-free icing sugar in place of regular icing
sugar.

Hope that this recipe will help you.  Good luck,

Clelia