Ink Review: Noodler's Ink - X-Feather. Grade: 67.50%. Paper Tested On: Norcom Composition, Staples 20lb, 85g Clairefontaine. Noodler's X-Feather (XF), aka Anti-Feather, at first glance may not be the flashiest ink out there. Some may overlook it as "just another black ink". However, XF's unique...