20% vinegar is an industrial grade acid. I havn't calculated the pH, but I don't think you would want to consume it without dilution. The stuff you get from a laboratory supply dealer is probably going to be higher purity than a "food grade", which is the lowest grade a supplier can sell to meet FDA guidelines. As with anything else, there is no substitute for knowledge. Mark MARK.GELO@worldnet.att.net Concord, Massachusetts -----Original Message----- From: Rick <rick1@i1.net> >> >Anyone know where I can buy 6 gallons of 20% acidity white distilled >> vinegar? > > Let's back up a little bit here, guys. Mary's asking for Vinegar, not >industrial grade acids. Since this is coming from the Fire Girl, I have >to believe she wants something she can safely eat.