Oh my goodness but this is beautiful!!!!!Every aspect of it is beautiful! Tears for the yellow chalk marks (which I'm not seeing in the pics.) I sometimes feel like it stays in the threads rather than the fabric. No matter where it is, doesn't exactly help, though. Sometimes I try to brush it away with a piece of batting soon after I've sewn the area. It won't help you now but I just bought some iron away chalk that I'm going to put in one of my chaco liners. Of course it's only available in white so it won't always work. Sure hope you can get that chalk out. what if you tried calling the manufacturer for help? Is there a chance that one of those Mr. Clean magic erasers would work? Test on something else first. They are pretty amazing.