I wash batiks (and any other quilting fabric) the same as I do my regular laundry....like colors together. I guess I've been very lucky because I've NEVER had an issue with batiks running/bleeding. I wash in the hottest water my machine has, with regular detergent and dry in the dryer. I never use color catchers unless I've found a color that bleeds and I've, unfortunately, only discovered that AFTER the quilt was completed. And it wasn't a batik!