[Alt-photo] Re: Food Grade Chemicals

[Loris Medici]

Hi Eric my gum arabic, sodium benzoate (for preservation of gum arabic
solution), vitamin c (used in developer) and agar agar stocks are all
food grade. When it comes to colloids food grade is the best - except
for gelatin perhaps, photographic needs are stricter with gelatin...

Regards,
Loris.


On 11 Tem 2013, at 14:26, 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