[anonymousse1234]

"do not use this ink in fountain pens "

This is not a fountain pen ink but recreation of historic inks used with non-fountain pens.

For fountain pens try Platinum blue-black, Pelikan 4001 blue-black, Diamine Registrar's.

[mcguire]

Noodler's Air Corps Blue-black, here! :-)

I was mostly looking at the mold comment.