[Alt-photo] Re: Food Grade Chemicals

[eric nelson]

That's exactly what I was thinking too Bob.
Thanks
to 
all 
for the reassurance!



On Thu, Jul 11, 2013 at 10:30 PM, BOB KISS <bobkiss at caribsurf.com> wrote:

> DEAR ERIC,
>         Many moons have passed, Kimosabe, since my father worked for Merck
> and Co...somewhere around the late 30s and then he was a pharmacist's mate
> on ships in the Merchant Marines during WW II.  But he taught me at the
> very
> beginning of my photographic endeavors (around 12 years old) that
> Photographic Grade chemicals were well below Food Grade in purity and only
> slightly better than Technical Grade.  Now this was half a century ago so I
> don't know if either the grading system has changed or my memory serves me
> properly.  The only time I would truly care about better than food grade
> (Lab or Reagent grade) would be with very expensive metal salts (silver,
> gold, platinum, palladium) and other reagents in their respective
> processes.
> Other than that you should be fine.
>                         CHEERS!
>                                 BOB
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf
> Of
> eric nelson
> Sent: Thursday, July 11, 2013 7:26 AM
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [Alt-photo] Food Grade Chemicals
>
> This is a cross post so sorry if you've getting it again.
>
> 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-photogr
> aphy.html<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
>
> --
> Eric Nelson Photography
> 086 343 1612
> http://ericnelsonphoto.tumblr.com/
> https://www.facebook.com/EricNelsonPhotographyBangkok
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-- 
Eric Nelson Photography
086 343 1612
http://ericnelsonphoto.tumblr.com/
https://www.facebook.com/EricNelsonPhotographyBangkok