...I wonder if acetic acid -- the main ingredient in vinegar -- other           
than water,  is also detrimental?...                                            
                                                                                
Allen,                                                                          
                                                                                
Freidrich Ruttner wrote a number of years ago that lactic acid could be used    
to invert sucrose for bees.  He warned against using "other acids," but         
didn't list the ones he thought were harmful.                                   
                                                                                
Kevin