I received a pre-owned Boheme today along with a pack of mystery black Montblanc ink cartridges. I popped in a cartridge - making sure it was firmly in there - and nothing. After some contemplation and mild frustration I decide to run the nib under some water. A stream of old blue ink gushes out and after some wiping I put the nib to paper. The ink flow was fantastic and never skipped. At this point the ink was taupe colored and it faded into grey then black. My Boheme wrote beautifully for a whole page of Rhodia, but all of a sudden it refused to cooperate. What was once a generous flow of ink was now a twisted hybrid of skipping and nothingness.
I should note that a similar situation occurred with my 149. The pens write amazingly well for a few hours, then...kaput! What is the source of this problem and how can it be remedied?