Purple colour disappears in the pen itself 2A 14 days after. The Brother Scan N Cut Erasable Pen Set CAPEN2 is for use on fabric. The ink contained in the Brother Scan N Cut Erasable Pen Set CAPEN2 can be erased by water, and the ink in the purple pen is designed to disappear within 2-14 days of application Scan-N-Cut Erasable Pens White These pens are for drawing seam allowances or creating other temporary markings on fabric. CAPEN2 | ScanNCut Accessories | Brother Purple And Blue Ink Pens Brother – Scan N Cut Accessories – Glue Pen For Foil Transfer Starter Erasable Fabric Pens In blue wash with water colour pen the leaves. Designed for use with the ScanNCut Pen Holder, these pens are ideal for drawing seam allowances and other temporary markings on fabric. Learn more These pens are ideal for mark of markers on the seam allowances or other substance. The ink in the blue pen can be erased by water while the ink in the purple pen is design to disappear within two to fourteen days of application.