Because ButterStix® have no dust, they might leave “ghost chalk marks” from the oil that is contained in the chalk. This is normal, especially after using the chalks repeatedly on the same surface. You can “cure” the Chalk Table Runner™ by smearing traditional white chalk across the Runner and erase with a dry cloth, then try it with our chalks. A Magic Eraser also works wonders in erasing the “ghosting.”
When used on Chalkboard Paint or Chalkboard Painted surfaces, ButterStix® can leave a permanent “shadowing” when removed. Depending on the surface, it can be removed completely with a Magic Eraser. Sometimes, however, it will permanently leave behind a remnant of your project. Nowadays, there are many different types of decorative “chalkboards”. Many seem to be non-porous, but unless the frame is made of a material like a slate or metal, most likely they have been covered with a chalkboard paint-like material by the manufacturer. Therefore, it almost always will leave the shadowing behind. Please keep that in mind if you use them in your home and test first prior to use.