How to make powdered sugar in the Vitamix

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This video shows how quick and easy it is to make powdered sugar in the Vitamix.
Save $25 or more on a new Vitamix. Click the following link for details:
secure.vitamix.com/redirect.a...

[@ItsMe-ep3yr]

I have made if without cornstarch. What is the cornstarch supposed to do?

[@2zwaantjes]

To keep it from making lumps I suppose.

[@JGilly-cp1tk]

Basically acts like a anti lumping agent so over time lumps and stuff dont develop

[@janepowers6711]

Adding cornstarch is mandatory for making glazes and icing, as it thickens the sugar into a proper paste. Even for other recipes, the starch will help prevent the powdered sugar from clumping due to moisture absorption. For each cup (200g) sugar, add 1½ teaspoon (7.5mL) cornstarch.
This ratio is very close to the 3% mix used in commercial powdered sugar.[4] While most online powdered sugar instructions call for more cornstarch, the result may behave unpredictably in recipes, or have a poorer taste.
Arrowroot powder is a good substitute for those avoiding corn products.