A year ago Lexikaliker got me a Super5 fountain pen It was the same time he got me a KUM Masterpiece. I paid just under €20 for the Super5. The Masterpiece was just under €10. . It has seen quite a bit of use in the last days – that’s when I noticed an issue I didn’t notice before. The outside of the cartridge keeps getting inky. First I thought that some ink got into the body of the pen, but a day after I cleaned the pen body the outside of the ink cartridge was full of ink again.
I am not sure what is happening. All I could come up with so far is that there might be some capillary action going on, between the wall of the cartridge and the grip section of the pen – similar to the capillary action in the nib. Maybe a different cartridge with a slightly different diameter or opening would behave differently.
Have you come across this issue – with the Super5 or another fountain pen?