Re: Casein -> it's the paint
Thank you very much for the long reply Guido. Was very helpful. Casein/acrylic has an interesting and pretty different look for sure. Now, I'm most interested by the fact that you can print casein on "gesso" or "latex paint". That's half the reason of why I'm interested with casein (the other half being to print w/ much more pigment compared to gum - as pointed by Alberto and others before.) even if I have a gut feeling that the transparent nature of gum will still remain better/more aesthetic to my eyes, though... I want to print on unusual media such as Yupo, polyurethane (or, more likely alkyd resin) sealed wood, aluminum sheets and glass; casein seems to have more potential - w/o loosing simplicity - in that area. (Have to re-visit that beer/waterglass coating too...) One other useful piece of information (for the purpose stated above) is Marek's (and Don's) descriptions of using foam rollers to apply emulsion. Brushing on impermeable media (and doing it as evenly as possible) is pretty hard; my expectation is that learning to use a foam roller will facilitate things considerably. Thanks to all again, hoping to return to the subject later with something worth to show. Regards, Loris. 25 Mayıs 2009, Pazartesi, 11:08 pm tarihinde, Guido Ceuppens yazmış: > Hi Loris, > Been away from computers for a few weeks so I can only chime in a bit > late: > I have been using casein/acryl mixtures for quit a long time now and > find it a favourite as it can produce very colourful images and seems > to be more sensitive and easier to use than gum/waterpaint but > requires a more vigorous manual "development" . I have used it on > paper sized with gelatine, gesso or white latex paint, and even on > gesso-ed artists canvas. > There seems to be two types of powdered casein on the market: my > favourite is the white fine powder, but it also comes as a coarser > yellowish sand-like powder. The fine white stuff dissolves quite > easily but the coarse casein takes more time and a different > technique. > > My recipe for dissolving the fine white stuff: > 15 gr casein in 100 ml water, stir : the casein does not dissolve but > is more or less evenly dispersed in the water. Dissolve 2.5 gr borax > in 25 ml boiling water. Immediately add the hot borax solution to the > casein and stir vigorously for a minute, let stand until cooled off, > ready. > The solution does not smell badly and when de-ionised water is used, > this solution can last a few days, until it stinks and gets watery. > > When only the coarser, yellow casein is available I prepare it as follows: > 15 gr casein in 75 ml water, stir and heat to very hot, but do not boil. > Dissolve 4.5 gr ammonium carbonate in 25 ml warm water, add to the > casein while stirring and keep warm for approx. 15 min whilst stirring > occasionally. Again let cool down. > This version smells strongly af ammonia. > > I add acrylic paint usually 1 part of paint to 4 to 12 parts (in > weight) of casein. > > As an example, the following image was made in 4 printings (using 4 > oiled paper CMYK negatives): > Paper: Schut acryl board, a thick but cheap paper, sized with two > coats of (undiluted) latex white paint. > 1. Yellow : (Y negative) 1 part Reeves Medium Yellow + 6 parts casein > + 3 parts Pot dichromate. > Dried with a hairdryer on high heat. Exposed for 30 sec. Stand > developed for 10 minutes then "cleared" with a soft brush (hake) to my > taste. > 2. Red : (M negative) 1 part Reeves Brilliant Red + 8 parts casein + 4 > parts Pot dichromate. Dried with a hairdryer on high heat. Exposed for > 30 sec. Stand developed for 10 minutes then again "cleared" with a > soft brush (hake). > 3. Blue :(C negative) 1 part Daler Rowney Process Cyan + 12 parts > casein + 6 parts Pot dichromate. Exposure 20 sec. Stand developed for > 20 minutes, no brushing. > 4. Black :(K negative) 1 part Reeves Mars Black + 10 parts casein + 5 > parts Pot dichromate. Exposed for 45 sec. Stand developed for 10 > minutes then "cleared" with a soft brush (hake). > > http://home.versateladsl.be/vt6100419/AltPhot/Landschap/loveisall.html > > Best, > Guido > > > 2009/5/24 Loris Medici <mail@loris.medici.name>: >> Hi all, >> >> I tried with powdered pigment and this time (3rd trial) got an image. >> So, >> >
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