The Bohin Chalk Pencil is my new, very favorite quilting notion. It is completely non-permanent on my quilt tops and has the added bonus of creating a very thin line.  This is the dream tool I have always wanted.  It comes with replacable chalks in a different colors.  So far I have tested and used the white and grey.  With just a click of the pencil I have a new point for drawing my applique shapes or quilting lines on dark fabrics. 

It does have the ability to remove easily so for a more long lasting white line on dark fabrics I have adopted the White Water Erasable Fabric Pen - Bohin. or the Water Erasable White Pen - Clover. They both work the same way.  You draw the line and wait few seconds for it to appear.  I have found that  its easily removed with a heated iron rather than the water.  I had great succes using the Clover pen for my recent summer applique project.