These Water Soluble pen refill work great for quilting, embroidery, dressmaking or other project where you need to fabric but do not want to leave a permanent marks Marks will disappear automatically after a certain period of timing It varies with temperature, humidity, cloth, preservations methods Water Erasable Marker Pen refill suitable for fashion students, tailoring professionals and garment making enthusiasts This Fabric Marker Pen refill your spots is as easy as applying Simply wipe with a wet cloth or sponge or allow that marks The Erasable Pen refill is no toxic or harmful present in our refill and there is no danger of inhaling any powdery residues