>I don't know of any harm that can be proven to come from that mold, which
is common in sugar feeding,

Dr Rob Manning, in a trial, found that at least one of the fungi that grows
in sugar syrup can produce mycotoxins that caused noticeable bee mortality.
 As Allen says, black mold is very common in syrup feeders, so we err on
the side of caution.  Chilling would slow the growth, as would the addition
of acid, bleach, some essential oils, or a preservative.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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