I am pre-washing my batiks (I'm making a quilt using 56 different batik fat quarters in all ranges of the rainbow) and have come upon some really stubborn ones. I have been dunking the individual fat quarters into a sink of water and swishing around for a minute or so.
Some don't bleed at all and I remove and hang to dry. Some bleed a bit and I soak once or twice with fresh water for 10 to 20 minutes and then they are okay. Some, however, I have left soaking overnight and the water is still quite colorful (so far, several of my teals and a few purples have done this). Should I keep soaking the problem fabrics or are they a lost cause? This is my first time using batiks and can't believe how much some of them bleed--the yellow really surprised me.