[alt-photo] Re: Storage life of diluted Gamblin PVA

[Jeremy Moore]

So far 6 months is okay, but that's as long as I've had any sit. Just shake
it up and you're good.

On Tue, Apr 12, 2011 at 3:37 PM, Don Bryant <donsbryant at gmail.com> wrote:

> I wonder if anyone can comment of the storage life of diluted Gamblin PVA
> using distilled water.
>
> Thanks,
>
> Don Bryant
>
>
> -----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
> Peter Blackburn
> Sent: Tuesday, April 12, 2011 11:17 AM
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Re: Casein source
>
>
> Alberto:
>
> Yes, you are exactly right-and you seem to handle your casein the same as I
> do. Ammonia breaks down the casein quickly at first and then progressively
> slower. When all is said and done, the ammonia odor becomes less pronounced
> as it balances with the dissolved casein leaving a "clean" smell.
>
> Peter J. Blackburn
>
>
> > From: alt.list at albertonovo.it
> > To: alt-photo-process-list at lists.altphotolist.org
> > Date: Tue, 12 Apr 2011 16:33:36 +0200
> > Subject: [alt-photo] Re: Casein source
> >
> > Chris,
> >
> > > ... I was able to get samples of sodium and ammonium which I mixed with
> no added alkali. I wanted to compare apples to apples in the mixing.
> Ammonium does get thinner after a few days and I am waiting to see if
> sodium
> does, too.
> >
> > The alkalies break the bonds among carboxylic and amino group of the
> casein,
> > which is a protein. The stronger the alkaly, the faster should be this
> > effect.
> > When I prepared my mix from casein and ammonia, I found that it would
> last
>
> > about a week in a tightly sealed jar in my refrigerator. However, as I
> have
> > already told, such a mix can be ready for use in less about half an hour.
> >
> > Alberto
> >
> > www.grupponamias.com
> > www.alternativephotography.com/wp/photographers/rodolfo-namias-group
> >
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