I've bought from them in the past when I lived in the US but in Thailand the shipping + customs makes shipping chemicals expensive and it's arrival uncertain. e ________________________________ From: Gerald Koch <gerald.koch@xxxxxxx> To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx> Sent: Friday, July 12, 2013 1:47 AM Subject: [pure-silver] Re: Food Grade Chemicals For many things such as sodium sulfite, hypo, citric acid, sodium hydroxide, propylene glycol, , etc I have bought from http://www.chemistrystore.com/. They do not sell developing agents however. They also sell bottles. Jerry From: Eric Nelson <emanmb@xxxxxxxxx> To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx> Sent: Thursday, July 11, 2013 2:16 PM Subject: [pure-silver] Re: Food Grade Chemicals Thank you all for the responses. I've not found a supplier here that can get me everything I need but it seems I'm making some progress which is encouraging. e From: Richard Knoppow <dickburk@xxxxxxxxxxxxx> To: pure-silver@xxxxxxxxxxxxx Sent: Friday, July 12, 2013 12:21 AM Subject: [pure-silver] Re: Food Grade Chemicals ----- Original Message ----- From: "Myron Gochnauer" <goch@xxxxxx> To: <pure-silver@xxxxxxxxxxxxx> Sent: Thursday, July 11, 2013 6:20 AM Subject: [pure-silver] Re: Food Grade Chemicals I have used 20 Mule Team Borax and household ammonia from the supermarket. Both worked as expected. I would be very surprised if the difference between food grade and reagent or laboratory grade made any difference to ordinary photographic processes. ... they only supply "food grade" chemicals. My understanding is that photo grade chemicals have low levels of photographically active impurities but other impurities can be there. Reagent grade comes with an assay showing exactly what is in it, that's why its expensive. It may be no purer than other forms. Sodium carbonate: There are three common forms, anhydrous AKA desiccated, monohydrated, and crystalline. Kodak usually specified the anhydrous form, AGFA the monohydrated form and crystalline is found mostly in old British publications. Monohydrated is the most stable because anhydrous will absorb moisture from the air if not kept in a sealed container. Kodak and AGFA specified granulated borax, presumably granulated crystals but not specifically stated. The definition in the old Photo-Lab-Index seems to show it to be the decahydrate. -- Richard Knoppow Los Angeles WB6KBL dickburk@xxxxxxxxxxxxx ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.