I've used the type that's refillable . . .and used the chalk used in Pounce pads, so it just ironed off. I definitely wouldn't use a colored chalk used in construction as there's who knows what in those dyes.
My preference is still drawing on the lines by hand. I purchased a metal drafting ruler on Amazon (48" long) and added HandiGrip adhesive pieces to the back so keep it firm . . .and then mark with Frixion pens (felt tipped, not ball point). I find that works better and is less messy.
Last edited by ClairVoyantQuilter; 08-11-2015 at 07:59 AM.