This book is available to read on the  internet .... Silver Colloids, Do They 
Work by Ronald Gibbs. He has  been the director of the center for Colloidal 
Science at the University  of Delaware since 1981.  He states in it that The 
DC-produced  colloidal silver products that they tested had the highest value 
of  ionic (dissolved) silver present and did not have highly rated  colloidal 
silver.  All of the highest rated colloidal silver  products tested were 
produced utilizing the AC process.  

                        
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