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* >
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