DIAOSnx 9-PACK,3-COLOR Vanishing Air/Water Erasable Ink Temporary Marking Fabric Marker Pen (2Pcs Each Color) Pink pen : Automatically disappear or wipe off with water in 1-7 days Purple pen : Automatically disappear or wipe off with water in 2-14 days Blue pen : Writing trace does not disappear automatically, but it can easily and quickly erasable by water The water soluble ink can disappear automatically NOTE: After receiving our products, you have any dissatisfaction or doubt about our products. Please contact us in time. We will give you a satisfactory result.