I took a white scrap of muslin and tested each color of the 50 pack of the Crayola SuperTips washable markers. Not all of the colors washed out. I did them one by one and set aside those that worked. Those that didn't wash out completely with cool water went into a school supply box for our church. I used cold because not all quilts will get washed in warm water. Then I tried Crayola Ultra Clean fine line washable markers. Every color washed out with cold water.