From: Tom Ferguson (tomf2468@pipeline.com)
Date: 03/07/02-08:15:06 PM Z
Well, I've also received a few private e-mails saying I shouldn't give up
yet. That is at least hopeful.
I'll pick up some Potassium Dichromate to replace the Ammonium Dichromate,
and try some ammonia in the wash water before admitting defeat.
-- Tom Ferguson http://www.ferguson-photo-design.com> From: Judy Seigel <jseigel@panix.com> > Reply-To: alt-photo-process-l@sask.usask.ca > Date: Thu, 07 Mar 2002 00:15:15 -0500 (EST) > To: alt-photo-process-l@sask.usask.ca > Subject: Re: Casein Prints, Sodium Caseinate Availability > > > > On Wed, 6 Mar 2002, Tom Ferguson wrote: > >> Sadly, I'm not impressed with casein. The powder from Kremer worked better >> than home-made from powdered skim milk, but neither worked great. All papers >> double gelatin coated and glyoxal hardened. All paint Windsor watercolors >> (lamp black and Thalo blue). Ammonium Dichromate, saturated solution. Tried >> three different papers, everything produced the same issues. Not a lot of >> steps (not much more than gum), poor separation between steps (worst than >> gum), no more saturation than gum (I had expected the "Gauche look" of >> Casein to be more saturated). Bummer :-( >> >> It does require a lot more physical clearing. After a half hour in wash >> water you really need to spray directly on the print to get it to clear. >> Interesting, but no real advantage. > > Tom, I think there's got to be something perverse about gum printers... > Just reading your description made me eager to try it !! Maybe the reason > Lukas did so well with it is that he BEGAN with it... I had his prints > here for a while and they were gorgeous. Tho he may not have done step > tablets (I don't remember), his colors were extremely rich and fairly > opaque. > > One difference comes to mind is that he was using only 7-1/2 to 10% > potassium dichromate. He also said he gave a layer of plain casein between > coats, without any dichromate. "Improves sharpness and prevents staining." > > And he used dry pigment... He said Kremer Spinel black was great, tho I > couldn't make it work at all for gum. > > Judy > >
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