I was looking for a quick and easy way to paint on fabric with natural ingredients that are washable, this fit the bill!
I combined earth pigments with this acrylik medium and painted a silk scarf that I love (and it's hand washable). Thinning it slightly with a little water made for easier silk painting, but too much water interfered with its ability to adhere to fabric. The paint does affect the hand of the fabric somewhat, but any acrylic paint will do that. This medium behaves similar to other acrylics and I would choose this over synthetic stuff any day!
I even did a little wood-block printing with it on the scarf.