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Re:Fountain pen ink properties by anonymousse1234 on Saturday June 13, 2020 @05:08PM (#23512749)
"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.

Re:Fountain pen ink properties by mcguire on Sunday June 14, 2020 @02:56PM (#23520277)
Noodler's Air Corps Blue-black, here! :-)

I was mostly looking at the mold comment.