do you wash your quilts when they are done? that is how i get the chalk out. i've not had any problems with the blue not coming out. only problems with the red/pink. if you do not want to actually wash your quilt (??) you could try a wet wash cloth. when i finish a quilt the next thing that happens when i finish that last binding stitch...i toss them into the washing machine...and the dryer...chalk washes out.