I mixed my own casein paint today with a pretty straightforward recipe.
Here's what I used:
Casein milk protein (store bought) — 12 g.
Water (tap) — 120 g.
Sodium Hydroxyde (NaOH 50% solution) — 8 drops
Raw Umber (dry pigment) — 60 g. (or 125 ml)
Total cost is around $7.00.
Above: The milk casein 15 hours after adding the NaOH.
The texture was then completely homogeneous.
Above: Starting with a small amount of pigment.
Above: I didn't know how much pigment I would need
so it was quite the experimental approach.
The "Oops! more pigment... oh... now more binder...
ah! more pigment again... oh! this looks just right!" kind.
Above: My tube with paint. It's a 110 cc.
Above: I ended up with about 60 cc. of paint which is
more than twice the amount in the Richeson Shiva Casein
paint tubes (which are, I believe, the only brand of
commercially available casein paint available).
I have yet to try the paint but it looks like regular paint both in saturation and in texture.
I'll keep you posted as I try different colors.
EDIT: I forgot to mention that I only used half of the casein preparation for 125 cc. of pigments. Next time, I'll get 250 cc., use all the casein and fill my 110 ml tube.
EDIT #2: Hahahahahahaaaa! LOL! My paint's rotten! I used the tube 12 days after mixing it and it was ok. 7 days later, though, it smells like a cow barn... in a bad way. I threw it away. I have to find a preservative or a stabilizer to add to my casein if I want to keep my paints longer than 2 weeks.