12PCS Vanishing Erasable Ink Felt Tip Adber Chako Ace Dressmakers Marker Pen (blue) The Blue Water Erasable Pen's writing trace does not disappear spontaneously, but it can easily and quickly erasable by water. The ink spontaneously disappears over a number of days or immediately if washed in water. The manufacturer strongly advises you to test the pen before commiting to use. Disappearing time may vary due to the material and size of the fabric and its surroundings such as temperature and air circulation. Can be used on paper, cloth, wool, wood and platics etc. An information sheet provided by the manufacturer is also included with this product. color: blue 12pcs per lot