Could be a component of a dark color. Try some paper chromatography with a dot of ink. See if any green shows up. I use coffee filters but paper towel will work.
@Tallastro 🇺🇦 I had two pens inked up with dark inks. One with Parker Quink Black and the other with Diamine Chilly Nights. I hadn't really handled either, but they were both in the same bag with the pen I was using. I see no evidence of leaking.
Interestingly enough, the pen I was using had previously been filled with green ink, but I'd cleaned* and re-inked it with something else a couple days prior. Maybe it was a leftover ink stain from when I did that? They usually don't hang around that long though.
* There was an ultrasonic cleaner involved, so it should've been really clean.
Tallastro 🇺🇦
in reply to Jonathan Lamothe • • •Jonathan Lamothe
in reply to Tallastro 🇺🇦 • •@Tallastro 🇺🇦 I had two pens inked up with dark inks. One with Parker Quink Black and the other with Diamine Chilly Nights. I hadn't really handled either, but they were both in the same bag with the pen I was using. I see no evidence of leaking.
Interestingly enough, the pen I was using had previously been filled with green ink, but I'd cleaned* and re-inked it with something else a couple days prior. Maybe it was a leftover ink stain from when I did that? They usually don't hang around that long though.
* There was an ultrasonic cleaner involved, so it should've been really clean.