I'm testing a blue remove with water marker, currently. I tried a pigma that matched my thread but want more flexibility if I want to change the design. Looked at some graphite and chalk pencils at Joann's today but the packages were very clear about making sure all of the marks were out before ironing. Haven't tried a frixion or crayon a marker yet. I don't think a silver Roxanne's pencil will show up.
Would love to hear others' opinions.