[Alt-photo] Re: Food Grade Chemicals

[Jack Fulton]

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