For great visibility, Miracle Chalk is the only chalk that stays in place, but vanishes like a ghost when steam ironed.
Specifically formulated for fabrics. Less airborne chalk particles. Mark a quilt BEFORE loading on long or short arm machine. No chalk "bounce" when sewing. Chalk marks are removed with the swipe of a steam iron.
For more information: Check out out YouTube VIDEOS at https://www.youtube.com/user/urbanelementzdesign