[alt-photo] Re: casein

[Christina Anderson]

Don,
I started out with 15% am di and it was too strong. I bet if you drastically cut it down it'll work better for you. But I do find casein shorter scale on a Stouffers--gum about 4-6 stops (usually 5.5) and casein about 3. But that is a quickie observation; I'd have to do it over and over and see if that is for sure before betting my $$ on it.
Chris
Christina Z. Anderson
christinaZanderson.com

On May 1, 2011, at 8:41 PM, Don Bryant wrote:

> Today I made my first printing test using the ammonium caseinate I made
> following (or supposedly following) the instructions and method suggested in
> E.J. Theisen's article published on the Unblinking Eye.
> 
> Oh brother what a horrid mess. I printed the traditional Stouffer 21 step
> tablet and I had 4 distinct steps. And at the same time I printed an in
> camera negative that demonstrated the same ugly results.  The coating was
> very splotchy, I had horrible dichromate staining. 
> 
> I also printed an in camera negative at the same time with very similar
> results. No detail, extremely weak pigment density. My printing time was
> about 2.5 minutes using a Nuarc 26K. I swag'ed the exposure time since I've
> not printed any gum prints on the Nuarc.
> 
> I had to hose the print to get development started, perhaps I was just
> impatient. 
> 
> I used saturated am. dichromate and DS Graphite Grey coated on PVA'ed Lenox,
> per E.J.'s generic instructions.
> 
> I'm glad that Chris and Marek are having success, time to stand back and
> assess my options.
> 
> Don
> 
>> 
> Marek,
> I am using 10% ammonium caseinate. 
> I too am very entranced by the quick development, minutes with brush or
> roller, only 1/2 hour otherwise. So with quick exposure and quick
> development, it is really fast.
> Even if you scrape the heck out of it, the grain is very fine,
> impressionistic, not flaky like gum. And the layer is very thin.
> I am using 10% pot di 1:1 and 3 minute exposures, thus my coating of casein
> is only 5% casein and 5% pot di, or about .15g pot di per 8x10 layer, given
> about 3ml coating.
> No smell at all, except a slight foetidity when developing, like wet dog.
> Chris
>> 
> 
> 
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