U of S | Mailing List Archive | alt-photo-process-l | Re: Casein

Re: Casein

I've done tempera printing - coated on yupo - but used water color tube
pigment.  I had to do a forced development - Put the a sheet of glass in
the bottom of a tray filled with water - placed the exposed print
exposed side up and brushed with a haku brush unitl the image appeared. 
Nice way to fine tune the development

phritz-phantom@web.de wrote:

> hello loris,
> i haven't printed printed with casein, but when reading your mail, i
> remembered an article on egg-tempera print on unblinkingeye - the only
> other alt. process that i've heard of that uses acrylics. (found here:
> http://unblinkingeye.com/Articles/TPrnt/tprnt.html )
> did you try to develop the print by force (running water, brush etc)?
> the method of developing egg-tempera prints in the manual is to
> "/Develop/wash in a flat-bottomed tray containing water, with a dash
> of dish washing up liquid added. Use a plastic foam roller to develop
> the image/".  maybe acrylics generally need a little bit of force
> during development.
> phritz
> ------------------------------------------------------------------------
> *Von:* "Loris Medici" <mail@loris.medici.name>
> *Gesendet:* 22.05.09 21:08:37
> *An:* alt-photo-process-l@usask.ca
> *Betreff:* Casein
> I did my first casein trial yesterday evening, w/o any success. See below:
> - 0.8g casein (Kremer's)
> - 5ml tap water
> - waited 10 minutes (to let casein absorb water - I'm not sure if that's
> necessary but did so anyway, I was not in a hurry...)
> - added 8 drops of 25% (910) ammonia (it seems to be a lot, will try
> halving the amnt. next time)
> - I mixed the slurry (cream consistency) until it looks homogeneous
> - I added 5ml of 5% ammonium dichromate (it turned to yellow - because of
> excess alkalinity I presume...)
> - I mixed the solution (not a slurry anymore, pretty homogeneous looking
> solution slightly less viscous than my usual gum coating mix)
> - made up a coating solution by adding the dichromated casein solution to
> a very small amnt. of W&N acrylic color (burnt umber)
> - coated the paper, dried with a hair dryer, humidified the paper with an
> ultrasonic humidifier, exposed for 2 mins. under a bank of UVBL tubes (I
> didn't get a dichromate image after exposure)
> - developed(!) face down for 20minutes
> I got absolutely no development, no pigment coming off, no dissolution of
> binder at all.
> What could be the cause?
> Overexposure? Using acrylics? (But I know someone - Guido Ceuppens - who
> uses acrylic colors with casein...) Both? Any other thoughts?
> Will try with only 30secs exposure tonight...
> Regards & thanks in advance,
> Loris.
> Text: GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!   
> Jetzt freischalten unter *http://movieflat.web.de*  

  • References: