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I've never had this black 'growth' in my jars/jugs. I switched from C&H sugar to a much cheaper sugar this year and I have to wonder if that didn't cause this. I am wondering if this is a mold. The 'new' sugar have Contents: Sugar stamped on the bags. Has anyone experienced this?

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See it also if not using bleach or apple cider vinegar. Wife feeds humming birds and it will get like that in the fridge if left to long as well.
 

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Paul,

You can add a "splash" of vinegar to the sugar syrup to lower the pH. The natural pH of honey is around 4 or 5 so the bees will accept the sugar syrup with no problem and you will have eliminated any mold growth.

Cheers,
Steve
 
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