Re: My first home made casein emulsion
Thanks for the response, David. I started with commercially available soy milk, curdled it with vinegar, dissolved the curds with borax, etc. It's not as satisfying as a dairy milk casein, but it's better than I expected.
Most of the soy paints I've seen offered (including those by Glidden, I'm pretty sure) use the soy with an acrylic emulsion. I've read about some of the work being done with soy oil based paints, and that's very interesting. As I mentioned before, making dyes with soy milk and pigment is a Japanese tradition, but it makes a fairly satisfying kind of watercolour too. I've scoured the web and can't find anything at all regarding a soy casein of the kind that I was attempting. Of course, the syrup / glue that you have at the end of the process isn't nearly as strong (as far as stickiness goes) as the kind produced with dairy milk. Perhaps that's the whole issue.
Tonight I did go ahead and make another batch of milk based casein, and it turned out just the way I wanted. I'm very giddy about it. Making this stuff reminds me of the days when I was learning to boil rice. It's not brain surgery, and it's very good when it turns out all right, but it takes a little trial and error.