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.
I was mostly looking at the mold comment.
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.