<<Disclaimer: Verify this information before applying it to your situation.>>

Ingrid,

I make powdered sugar in a Vita-Mix.  This appliance is a blender designed by
a maniac.  It will reduce wooden blocks to sawdust, although that dings the
container.  Among other things, it can be used to:

     chop                               make crumbs from bread
     crush ice                          make snow cones, slurpies & juice bars
     make soft-serve frozen desserts    make fruit syrups
     powder sugar                       grind grains, coffee, beans, and peas
     grind meat, shred cheese           whip cream (makes butter too)
         "juice" (actually puree all edible parts, much more nutritious)
         mix dough (can start from whole grain)
         cook puddings (by friction from the blades!)

Although a little on the loud side, it will powdered sugar with no problem at
all.  The process produces steam, and the finished product has a metallic
smell while it is still hot that goes off it as it cools.  I use this powdered
sugar all the time for icings and so forth for two little corn intolerant
celiacs.

If you find this curious, you should contact the manufacturer:

          1-800-VITAMIX or 1-800-848-2649
          8:00 a.m. to 11:30 p.m. Eastern Time Weekdays
          9:00 a.m. to 11:00 p.m. Eastern Time Weekends

          Vita-Mix Corporation
          8615 Usher Road
          Olmstead Falls, OH  44138

--Douglas
Pittsburgh, PA
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