What's the best marking tool for marking the quilt top for quilting?
When will you mark your quilt? Do you want to make sure it's not going to fade?
How detailed is the marked quilting design?
Are you going to wash your quilt?
BUT, never, never, ever heat the marks in your quilt. Don't iron. Don't leave in your project in the car.
Heat can make the ink left in your quilt reappear. Usually as a brownish marking.
Dark Fabric? No problem! It takes a little while for the marks to appear (kind of like that 'spinning ball of death' on your computer when a page is loading) but they do eventually appear. All it takes is an iron to get rid of them.