Icing sugar to brew?

[Nigelatcroft]

I'm about to brew a recipe which uses 'white sugar' -can I use icing sugar?..

 

[ao125]

http://www.ehow.com/facts_7147052_use-powdered-sugar-instead-granulated.html

To substitute powdered sugar for granulated sugar, you must use 1 3/4 cup of powdered sugar for every 1 cup of granulated sugar the recipe calls for. Powdered sugar is very finely ground granulated sugar, and this is why the ratio for powdered to granulated is so high.

Considerations
Powdered sugar contains 3 percent cornstarch, which helps give it a powdery texture and prevents caking. You should keep this in mind before substituting, because the addition of cornstarch could yield positive or negative results depending on the recipe. If you are cooking something with a sauce or gravy, the added cornstarch will cause it to thicken. However, using powdered sugar in place of regular sugar in baked goods may mean your recipe will not rise as much.

Also:
http://www.dlc.fi/~marianna/gourmet/i_sugars.htm

More about cornstarch in beer:
https://www.homebrewtalk.com/f12/cornstarch-100147/

 

[Nigelatcroft]

Thanks that is really helpful ( and interesting) will stick with the granulated methinks