I think that you need to distinguish between what we would know as icing
sugar - this contains an anti-caking agent, trisodium phosphate - and
powdered sugar, i.e. sugar that has been crushed to a fine powder and
contains no additives.

Incidentally, icing sugar is unsuitable for feeding bees as the trisodium
phosphate will not dissolve in water and leaves a thick sludge in the
feeders.

Peter Edwards
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from: "Karen DeHond" <[log in to unmask]>

> I have read that powdered sugar should never be used in hives as it
contains
> flour and will clump and cause problems,  I'm sorry I cannot find the
source
> of this information but I would appreciate some opinions on this.