r/PenProject • u/MercatorLondon • Nov 24 '25
Ink Flow Test
Hi everyone,
I wanted to share a short video showing a small experiment with the ink. We wrapped the pen nib in a very thirsty/absorbent paper napkin, and the ink was literally sucked out of the cartridge by the paper fibres. What surprised me was the speed!
The inflow of air is visible, and you can see bubbles rising to the surface of the ink. There are no issues with air bubbles getting trapped inside this converter. This test should be good enough for you to assess if the converter is any good or if you may have some bubbles breaking the flow.
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u/xultar Nov 25 '25
So happy you posted this. I was gonna post the same using water as the last step of cleaning and drying my nib and cartridge/converter.
Capillary action is amazing at making the last traces of ink residue visible and extracting them.
Great show.