10X (ultrafine or superfine) sugar is the finest powder and what you will find on your supermarket shelves. Bakers and confectioners are the only ones who have use for most other grades such as 4X (fine) and 6X (very fine). If you have no confectioner's sugar, you can put some granulated (regular) sugar in a blender with a pinch of cornstarch and process it.
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