I have a Cross Townsend fountain pen, and I've been using ink cartridges in it for some time. Yesterday I found my converter, which had been misplaced along with the box. I'd like to use the converter rather than the cartridges, but I don't think I can get Cross ink locally. I could order it over the phone or on-line, of course, but I'd rather not.
Now, I know the various pen manufacturers reccomend that you use only their ink in their pens. This makes sense from a business point of veiw, after all Ford doesn't tell people "Buy our truck! But go ahead and put a Chevy engine in it." But is it practical as well? There's one store in town that sells fountain pen ink, and it's Sheaffer. Would it affect my Cross negatively to use a competitor's ink?