That's an interesting definition as
Casein paint is actually derived from
Casein glue.
Casein or
animal glue is the good old fashioned glue that you sent horses to the glue factory for.
All paints have three elements
Medium; water,oil,latex,
etc.
Pigment; pretty standard across the board, Ancient Egyptians through the Renaisance Masters would grind minerals, semi-precious jewels, and at times gold and more precious jewels to create pigments. Usually they are a powder in thier natural states.
Binder; In oil based paints the oils dry out and get sticky which creates a
binder, In latex paints the latex dries and the rubber is the
binder, In water based paints the
binder can be anything from Tempra paints that use egg whites as a
binder < which is what the Michelangelo used to paint the Cisteen (sp?) chapel or in the case of
Casein paints
Animal glue.
Animal glue is literally really thick Jello to make it you use dry
casein which comes from rendered animal parts, hooves, skin,viscera, which is then dried and crushed into a powder. This dry
casein is mixed with water in a double boiler until it melts down like Jello.
Animal glue is then mixed with water and
pigment to acheive the proper colors
Advantages ? Hmm Very vivid colors incredible
binder. I don't know where the Wikkipedia definition got the idea that it can't be used on
canvas. Across the stree form my
theatre is a Masonic
hall with Drops that were painted in 1927 the colors are as vibrant as the day they were painted,and I've seen drops that have been folded over and over for years with no degradation or flaking. Now if you don't know what your'e doing it can be flaky and thick and in thick coats it it would crack off, which brings us to disadvantages.
Disadvantages, "pot-life"
Casein can go bad rather quickly. When it does go bad, being an animal based material it stinks. Not just a little it stinks a lot. Getting the proper mix of
casein water and
pigment is an art. A very difficult art and if you don't get it rightIt will either flake off or break off.
Yes you can still get it.
Casein glue is still used especially in the manufacture of violins and other musical instruments.
Dry scenic Pigments are harder to come by and I don't know where you might get them. Some of the pigments are also toxic, and thus dangerous to use.
How's that ?