This is a comment perhaps about the other unanswered question.
Avoid the pounce in red and blue. The colored chalks are not always easy to remove. There ae two kinds - the regular chalk which bounces off your quilt and should be marked only a little at the time. Some will spray with hair spray to keep the chalk in place while quilting. The other is Miracle Chalk which is usually removed with the steam iron. In the latter case rather than pounce like you clean a blackboard eraser, you just wipe it over the stencil.
Bottom line is to avoid the colored chalks. White and light grey pencils are ok.
Now having said all this, I have seen quilters use the colored chalk pencils with success.