Never trust a Batik not to run or bleed! If you are going to pre-wash, Retayne is a better choice, it will set the dyes. This is something to do BEFORE you cut into the fabric. Retayne and Synthropol both require 140 degree water for the best results. If you have used Retayne , the items you make from treated fabrics should be washed in cold water.
The most notorious bleeders are the "watercolor" batiks.... but some of the other styles of batiks use the watercolor batiks as the base or background fabric.
It always facinating that when I soak and pretreat the colors that can come out. Colors that do not appear to be in the fabric.