I have an odd problem with a Visconti 23k Pd fine nib in a new old stock pen:
The pen writes beautifully with a reasonable flow normally. It starts immediately if it's been used the same day with no skipping and hard starting. The nib is well adjusted with good alignment and no baby bottom that I can see. Also the nib slit narrows well to the tip. It's not the softest Pd nib I've tried but is one of the best writing ones with, unusually, a lovely pencil like feedback.
However... If it's been capped for a day or longer, it won't start writing at all, even though there's ink in the nib slit to the tip from the look of it. Any normal 'encouragement' does nothing, like light pressure to move the tines or repeated light nib tip 'dots' with the pen held at a high angle to encourage flow . I can write line after line with not a drop or smear appearing on the page.
Weirdly, if I run my finger or a tissue under the nib from the feed to the tip, or on top of the nib, the ink that is in the nib gap immediately runs over the nib and that will often allow it to write normally afterwards.
When it does write, the ink doesn't show sign of drying any more than any other pen. The cap is airtight I've tried flossing gently to remove any foreigners... It's a mystery to me how or why it does this.
For information the ink is Robert Oster 'Caffe Crema' and the paper is Oxford Optik or Clairfontaine.
Any thoughts as to what I can do remedy this?