soy milk recipe for Japanese dye & stenciling technique, mentions that One cup of dry beans will easily yield two cups of swollen beans. This in turn will yield enough soy milk to easily size seven to eight yards of wide china silk.
The class I took from Al-Jania at Gulf Wars 2014 included pokeberry. I got to bring home a half gallon jar of dye bath from the class. :) [ Pokeberry Dye Inspiration: from Harvesting Color by Rebecca Burgess ]