I don't have the need to use waterproof or semi-waterproof inks so wouldn't use any Noodlers ink in any of my TWSBI Diamond 580 pens. In fact I would...
There are literally thousands of fountain pen inks that are suitable for your TWSBI. Half of everyone who answers will give you their favourites. The...
Oh, Jon, Jon, Jon. You have done it now --- opened Pandora's ontology box! I will stipulate that you may have "friends" here on this forum, but only...