I use Retayne to soak my batiks and colors that I think will run.
That way I have never had a problem. The directions say to use
1 tsp per yd of fabric but I only use 1/2 tsp per yd and soak the fabric
in hot water for 45 mins. I then put it through a cold rinse in my
washing machine and then dry it. This works really well for me.
I am a slow quilter and would be devastated if fabrics bled
after I was done. Also, I give a lot of quilts away and so I want
to be sure they don't run since I am not the one washing them.
Judy