The yellow, blue and red does NOT come off even when washing. There are many previous post of us who have had problems with this product not coming off. Try the 1/4 masking tape. That should help you the best. I do use the white clover powdered chalk and it comes off easily
Last edited by QuiltnNan; 01-10-2016 at 12:39 PM.
Reason: remove shouting, not permitted