QUOTE(dwmatteson @ Aug 29 2007, 02:29 PM) [snapback]359464[/snapback]
True, but I'm fairly certain that refill is a Fisher space pen refill for the ballpoint model. I've wondered about the Sensa fountain pen ink as well, but never got motivated enough to post a question (or do the background research myself).
Finding nothing on the cartridges or packaging, in the owner's manual or other printed material, I called 1-800-BEST-PEN and reached the Parker Waterford support line. A "Oh, you want Sensa?" transfer and a little gentle insistence later, I was told that Sensa makes their own ink, that it's only available in cartridges, that they can be obtained from Sky Sailing (
http://sensaonline.com/) and come in black or blue 12-packs for $4.00.