[alt-photo] Re: casein and tsp

[Marek Matusz]

Gord,
Slightly different:
12 g casein, 3g ammonium carbonate, 100g water. DIssolve ammonium carbonate and add casein, mixing with a spoon. My bactericide was 2g of Consan 20 solution (the solution was mixed from concentrate 1:10). It is likely too much, but it works. I waited a day before using. Now a few weeks later the casein solution looks and feels the same. I have been using some FA papers sized with gelating/hardener, my stock gum papers. Chris is using PVA size as far as I can recall from the emails and she noticed that a heavier layer of sieze is needed. I also noticed that on heavier siezed papers the highlights can be much cleaner. On the other hand I just made a print on an unsized paper that looks quite nice.
 
 Marek
> From: gjh at shaw.ca
> To: alt-photo-process-list at lists.altphotolist.org
> Date: Thu, 5 May 2011 09:25:19 -0600
> Subject: [alt-photo] Re: casein and tsp
> 
> Is this your ammonium carbonate formula?
> 
> 2 parts Casein Powder16 parts water1 part Ammonium Carbonate
> (or clear liquid ammonia*)Dry Pigments paste water
> How are you sizing?
> 
> ----- Original Message -----
> From: Marek Matusz <marekmatusz at hotmail.com>
> Date: Thursday, May 5, 2011 8:30 am
> Subject: [alt-photo] Re: casein and tsp
> To: alt photo <alt-photo-process-list at lists.altphotolist.org>
> 
> > 
> > Gord,
> > Sounds reasonable. It is known from old literature that casein 
> > can be solubilized    with a number of salts. 
> > WHat is actually at work is a high pH that partially hydrolyses 
> > the casein. To that effect hydroxide are effective, but also 
> > salts that in  would make high pH solution. Trisodium 
> > phosphate would certainly fit
> > Let us know what happens. I am quite happy with my ammonium 
> > carbonate recipe.
> > Marek
> > > Date: Wed, 4 May 2011 22:07:05 -0600
> > > From: gjh at shaw.ca
> > > To: alt-photo-process-list at lists.altphotolist.org
> > > Subject: [alt-photo] casein and tsp
> > > 
> > > I have some purified casein and am going to try casein 
> > printing again
> > > 
> > > I have this:
> > > 
> > http://www.sigmaaldrich.com/etc/medialib/docs/Sigma/Product_Information_Sheet/c5890pis.Par.0001.File.tmp/c5890pis.pdf> 
> > > I am curious if anyone has used tri-sodium phosphate (TSP) as 
> > a casein 
> > > solvent rather than ammonia? TSP is used in a number of casein 
> > paint 
> > > formulas.
> > > 
> > > Gord
> > > 
> > > -- 
> > > Gordon J. Holtslander
> > > gjh at shaw.ca
> > > 
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