I use mostly Rhodia and Clairefontaine. On Clairefontaine Triomphe I can literally leave it overnight and it will smear the next morning -- obviously not to the point where the text is blurred out but it's bad enough that if I fold a page over or run my finger over a word there will be noticeable smearing. Finicky behavior has mainly been the inks tendency to dry out easily (which is strange since it won't dry on the page) namely in a Levenger pen I own which I haven't had any other issues with.
I obviously don't buy into it since I own a bottle of the ink already. I actually purchased my bottle from the Goulet Pen Company. However, the smearing makes this an ink I cannot use everyday.
I am thinking of going with the Sailor Kiwa-Guro since I've had excellent experiences with Sailor in the past and it has been suggested quite a few times. Thanks to all!!
I'm sending out my monthly batch of ink sample this Friday. I can send you a sample of Kiwa-guro along with three other black inks for you to try. Let me know!