"Having added
acid, however, they may not be. "

From experience the acetic acid from the vinegar does not really stick around all that long.  When you take a new brick out of the mold that was used to get the initial set of the sugar into a block you can still smell the acetic acid a bit.  But after bricks are open on all sides for a couple of weeks the acetic acid is gone in my experience.  What does the acetic acid do?  Probably nothing at all from what I have seen.  Plain water works every bit as well as vinegar.  There are zero nutrients in the usually suggested apple cider vinegar that are of any use to  bees other than the acetate itself which is a good source of carbon to make a variety of biological materials ranging from fats to cholesterol.  But, if the acid evaporates the bees to not even get that benefit.  The mother of vinegar which is so highly valued by the fringe whacko extra nutrients community is simply a bacterial by product that is an indigestible type of cellulose gum.  You would get the same health benefit by eating some saw dust and would not acid etch your teeth with the saw dust.

Dick

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