It was nice to see you doing it from scratch and making up a big batch.
I have been painting with casein - which is a milk paint by Shiva. I haven't tried it yet, but I do have the emulsion and you are supposed to be able to add pigments to it and have the milk paint. I know I can add watercolor paint pigments to it and also gouache. I would like to try grinding up stones to see how that does. It is supposed to be somewhat removable when drying, but it does set up and become water resistant or you can varnish over it. I know that your method is cheaper, but this is able to do fine lines that you can't get with acrylic paint.
I love using it and just wanted to share that with you.