Can you make confectioners sugar from regular sugar?
Yes - confectioner's sugar or icing sugar is powdered sugar with
about 3% cornflour.
You'll need a food processor, blender or mortar and pestle.
Weigh white sugar then add an additional 3% cornflour. Blitz it
ferociously in the processor or blender, or grind it in themortar,
till you achieve a fine powder.
When you rub the mixture between thumb and finger you should not
be able to feel any granules.
But... icing sugar is relatively inexpensive and it keeps