[alt-photo] Re: Flaking casein print

[Marek Matusz]

Matti, Did you solve your flaking problem? You can certainly overload cesein with pigment and gat bad flaking as in this example https://picasaweb.google.com/105732508998271877151/CaseinPrints#5602320969909790994 Marek   
 > Date: Wed, 26 Sep 2012 13:16:05 +0300
> From: mjkoskin at gmail.com
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Flaking casein print
> 
> ▼ Hide quoted text hi,
> 
> I've done recently casein prints using acrylic paints, and till yesterday
> with various success., sometimes really good results. I have used always
> the same mixture of casein (made from cottage cheese and ammonia) + equal
> amount of casein and pot dichromate + black acrylic paint. I've used the
> same method to develop, first soaking the print abt. 5 mins in lukewarm
> water and then roller developing with diluted dish washing liquid like
> tempera prints. Tempera prints have never stick well on the paper like
> casein. I size the paper with PVAc. First 1 part glue + 3 parts water, let
> it dry, then another coating with 1 part glue and 1 part water. Have worked
> fine. Diluted gesso leaves too uneven coat. Yesterday the print was all
> black, no colour got off. Day before yesterday just ok. I think the problem
> was too hot hairdryer. Now I made a new print, coating A3 paper and cutting
> into two A4, just to test the first piece. It flaked really badly. Only the
> dark parts of print stayed on the paper. I increased the exposure time.
> Better result, but bad flaking. The print was very contrasty, only black
> and white, and the white parts got off with bad flaking. Earlier the prints
> have showed nice tones from pure black to white.
> 
> One thing I can think of is that the glue sizing was probably bit humid
> with the succeeded prints, and thus the casein stuck on the paper. Even
> long exposures (normally 3-4 mins) but even with 15 to 20 mins develop
> fine, though it needs more force to the roller and takes much longer to
> develop, but finally the image on the paper comes out fine.
> 
> But now just bad flaking and contrasty prints. The tap water comes from
> hundred meter deep drilled well, so the water is not always the same, it
> changes every now and then. I have somewhere a pH meter, but not found it
> yet from the pile of junk including lenses, cables, amplifiers, computer
> parts etc.
> 
> Any ideas?
> 
> tnx
> 
> -matti
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