best ink for grading papers :)

[Levon]

I'm relatively new to FPs (though I grew up using Pelikanos in school long time ago).

I now teach at the college level and would like some recommendations for inks (presumably red, but open to suggestions) for grading papers, mostly cheap'ish notebook or computer/xerox paper. I tried Red Dragon Diamine, but didn't like it that much. Right now I'm using Monteverde Mandarin Orange for the time being.

If you have a favorite grading FP you want to recommend please let me know. My collection is very modest, a Lamy Safari, Pilot Metropolitan and TWSBI Eco - all Fine nibs, though I'm thinking of getting another Eco with a Medium nib, for grading.