For fine lines get the fons and porter mechanical pencil. It makes a very fine line. I have only used the white "leads" and believe me it comes out, too well! I marked a lot of a quilt before starting to hand quilt it and all the marks were gone by the time I finished with my first hoopful. I love the pencil so now I mark each area just before I'm about to quilt it.
I have never had problems with white chalks coming out but I have had problems with yellows and blues.