Does the Miracle Chalk hold up to handquilting - rubbing your hand over the fabric for lots of hours on end without rubbing off?
I am finishing off a dark quilt - will have to remember to take a scrap of the dark fabric - mark w/ frixion to get the "white" line and then throw it in the wash to see if it disappears again. My guess is yes, because I do know that the frixion washes out because I've seen that before.
If washing the quilt returns the color to the quilt, then for me, it is no longer an issue. I do have the Fons & Porter white pencil that I use. It's ok - but still love the ease of the Frixion better.