Somehow I scratched my hand while quilting and got blood on the quilt. I used my own blood and rubbed over it and took cold damp cloth to remove it and the spot came out leaving no stain. An instructor told us about it in class and I was skeptical until I had to try it. It worked. Patsy Thompson in her tutorials sprays her quilts using a wall board. I am trying in on my QAUG I'm working on now. I'm assessing whether I like it or not.