[pure-silver] Re: Food Grade Chemicals
- From: Gerald Koch <gerald.koch@xxxxxxx>
- To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 11 Jul 2013 10:13:28 -0700 (PDT)
Many people think of photo grade as being very pure. But actually all this
designation provides is a guarantee that there are no impurities that will
effect photo materials. In actuality this form can be quite impure.
Food grade should be sufficiently pure for photo purposes. By being free from
dangerous impurities it should also be free from impurities that would effect
photo materials.
Jerry
________________________________
From: Eric Nelson emanmb@xxxxxxxxx
To: pure silver <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, July 11, 2013 5:46 AM
Subject: [pure-silver] Food Grade Chemicals
I've finally found ONE chemical supplier here that has some of the chemicals I
need and use, but it turns out that they only supply "food grade" chemicals.
Now this means that the prices can be cheap, which is good. While talking to
them, I asked about their prices, which they don't list on their site.
(http://www.ucs1986.com/chemical.htm) They asked me which chems I wanted, so
quickly scanning the list online I figured Sodium metabisulfite would give me a
good benchmark as to their prices. 1 kilo is 82 THB which equals $2.63.
Score!
Umm, Maybe!
So my question is, how usable are food grade chemicals in photography? My
guess is that with something like a metal salt (not sure what that would be
doing in "food") in food grade might not be the best choice. This subject has
been covered at length on this apug posting, but goes on ad nauseum
(http://www.apug.org/forums/forum37/61248-food-grade-chemistry-ok-use-photography.html)
and I'm hoping for a more concise discussion from personal experiences or 2nd
hand experiences even. :)
e
Other related posts:
