Wahl-Eversharp ink was custom formulated to work perfectly in WAHL, WAHL-EVERSHARP, and EVERSHARP pens.  The 2 exclusive colors are correctly, moderately acidic on the ph+ scale helping assure long sac life.  The flow and rich shading characteristics are superb.   Click on the image above to see more details. (Tip: to help with long and trouble-free writing pleaseure, avoid alkaline inks for all WAHL and Eversharp pens.)