Private Reserve 60ml Ink Bottle Infinity Black (with ECO formula)

The Private Reserve Infinity Fountain Pen Ink with the E.C.O (extended cap off) Formula

So, why did we name it Infinity?

We tested the ink in a pen with its cap off for many hours and the performance was stellar. If you write with the fountain pen intermittently, theoretically, it can be cap-off ‘forever’. We offer the Infinity Ink collection in our beautiful 60ml luxury ink bottle.

Note: Your exact results will vary based on your specific pen, environment, etc, but the testing was pretty consistent to be able to leave a fountain pen uncapped for an hour and to have it start writing back up without issue.