Dear Neville, Reagent grade should refer only to the purity, rather than concentration. In other words, even though it's not "pure" inasmuch as there's a lot of water, the levels of contaminants *other than* water would be very low.
Look in a chemical supply catalog and you'll see a bunch of different grades for things, each of which is uniquely specified for each type of material, depending on how hard it is to make it pure and what kind of process it's to be used for. It would be un-economical, but you could probably get 3% reagent grade, for instance. But given the expense, most users would buy more concentrated versions and dilute it themselves. Without looking at a chemical supply catalog, I would bet that something like 35% reagent grade would be one of the more popular offerings... concentrated enough to be worth the expense of processing, packaging and shipping for the customer, yet not concentrated enough to be unstable or suffer a shortened shelf life. I hope that'll clear things up a little! <grin> Be well, Mike D. > [Also consider REAGENT grade.] > > This would be fairly high percentage you are talking about here though > wouldn't it? My research suggests there is your 'plain' HP, (3% or 6% > as sold OTC), 'up to and including 35% Food Grade' HP, (which I can't > get pharmacists to co-operate with in my enquiries), and then it goes > into the higher percentages over 35%, eg; 70%, 90% etc, which comes into > the 'Reagent' terminology as it starts to get somewhat 'unstable' above > 35%... [Mike Devour, Citizen, Patriot, Libertarian] [mdev...@eskimo.com ] [Speaking only for myself... ] -- The Silver List is a moderated forum for discussing Colloidal Silver. Instructions for unsubscribing are posted at: http://silverlist.org To post, address your message to: silver-list@eskimo.com Address Off-Topic messages to: silver-off-topic-l...@eskimo.com The Silver List and Off Topic List archives are currently down... List maintainer: Mike Devour <mdev...@eskimo.com>
