you should test what ever you want to try to use. just because it came out of my quilt does not mean it will come out of yours! i have had good luck with chalk and with just a pencil, but i always test to see if it will show-up enough and wash out. i ruined a quilt by using a (disappearing-ink) pen a quilt shop owner insisted was what i should be using. now i test everything, and i use what ever can be the lightest and least amount of marking as possible.