Do pretreat with Retayne. Many batiks will not always run immediately since some still have a amount of resist still in the fabrics . I am always concerned when someone tells me they have not had a problem ...yet! Even if it had gone thru the wash and there was not a problem ... Considering there is a chance that a quilt could be left in the washer over night after it has completed a cycle and there is still water in the fibers ... this can have the dyes migrate to neighboring fabrics. I ahve had others tell me that the fabrics ran on the second wash , this is because there was some resit , and the soap eventually removed it and then they ran. I have found the Hoffman 1895's to be some of the worst for running and bleeding.
Note the manufacture recommends hot water (140) for pretreating with Retayne. Why risk a disaster?