[Alt-photo] Re: Food Grade Chemicals

[eric nelson]

I'd agree on testing first, although in some cases, when making HCA for
example, it's kind of hard to test except to make sure that it does indeed
clear platinum/palladium prints. But there are residual silver tests for
silver gelatin papers which could be employed to make sure it's been
cleared of hypo.  I've never had a positive test fortunately. :)



On Thu, Jul 11, 2013 at 9:12 PM, Jack Fulton <jefulton1 at comcast.net> wrote:

> Not using as many chems as most of you, in my b/w work and out of sodium
> carbonate, I found it at a pool supply store
> and it worked fine . . later, comparing it with Kodak's product, which was
> in appearance much cleaner, I found no difference.
> Hence, like Sam, I found no difference but rather than simply switch to
> less costly source I'd think it to be wise to compare
> initially.
> Jack
>
>
>
> On Jul 11, 2013, at 5:14 AM, sam wang <samwang864 at gmail.com> wrote:
>
> > The ferric ammonium citrate I received many years ago for cyanotype was
> food grade. I think as long as you can find it, food grade or not makes no
> difference.
> >
> > For many years casein was mainly available commercially as a food
> source, and smallest quantity you could buy was 50 lbs, at about $1/lb.
> >
> > Sam
> >
> > On Jul 11, 2013, at 7:26 AM, eric nelson <emanphoto at gmail.com> wrote:
> >
> >> 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-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
> >> _______________________________________________
> >> Alt-photo-process-list | lists.altphotolist.org/mailman/listinfo
> >
> > _______________________________________________
> > Alt-photo-process-list | lists.altphotolist.org/mailman/listinfo
>
> _______________________________________________
> Alt-photo-process-list | lists.altphotolist.org/mailman/listinfo
>



-- 
Eric Nelson Photography
086 343 1612
http://ericnelsonphoto.tumblr.com/
https://www.facebook.com/EricNelsonPhotographyBangkok