Wide Range of Applications---This water erasable pen are mainly used for marking in clothing, shoes, leather and other industries. Vanishing Time Varies Depending On Method of Use---The vanishing time varies greatly depending on the method of use (e.g. point, tag, line segment, line label, etc.).When the pencil is flushed with water will the record disappear (blue). Vanishing Time Varies Depending On Texture---On strong absorbent fabrics (e.g., cotton, polyester, sponge), traces will disappear after a long time. On weak absorbent fabrics (e.g., nylon and chemical fibers), traces will disappear quickly( and purple). Disappear Automatically---The trace usually disappear within a few hours to one or two days, usually no more than 10 days. The vanishing time will vary with temperature, humidity, air circulation and fabric. After painting, it will slowly disappear, in the specified time does not disappear. ( and purple) Double Head Design---This water erasable pen adopts double head design, one end is the fiber head water soluble pen, one end is the water erasable pen.