I realize this post is old, but I figured I would post my results anyway!
I am making my prom dress this year (ivory satin) and needed to stencil on a pattern, so I used freezer paper stencils and mixed some black acrylic paint with black fabric dye (about 50/50) and painted over the stencil, let it dry, peeled it back, and VOILA! Fabulous stencil work! It did bleed a tad once or twice but only if the freezer paper wasn't ironed down well, so it was easy to compensate for.
And although this post was started nearly five years ago, hopefully this helps someone, lol.