These pens work great for quilting, embroidery, dressmaking or other projects where you need to mark fabric but don't want to leave a permanent mark. Erasable Fabric Pen gives you precise smooth lines, which disappear like magic over air.The ink will disappear within 1-4 days from most fabrics, actual fading duration may differ depending on the humidity of the environment. The ink marking can be immediately erased with water.Perfect for marking your fabric for sizing or altering etc.Always test on a scrap fabric first before marking your work.Ink might smerge on some fabric.