I just finished quilting a black and blue quilt- it had one busy print with a white background. I used a white chalk pencil
(as in colored pencils) for the dark areas, and a frixion pen on the print. There were some tight details to mark and the pencil stayed on nice and clear but was gone by the time I finished the quilt. I live in Florida, so I wasn't worried about the lines reappearing with the frixion pen. I'm a new quilter. too, so I was very happy with the results. I'll post a pic when it stops raining and can get a good picture lol!