Official Luthiers Forum!

I know you can make your own casein plastic by combining milk and vinegar, but I'm looking for a real high quality source I can buy in small quantities. I want to experiment with making my own flatpicks from bulk sheets, so ideally it would have to be about the same thickness as a really thick flatpick.

I know you can also buy old buttons on EBay and elsewhere, but would prefer to find a wholesale source for sheets of casein. Does such a thing exist out there?

Thanks,
Scott