I'm a fountain pen guy, and typically keep 3 inked: one with Noodler's Bulletproof Black for note in my lab journals, one with Noodler's Blue-Black or Legal Lapis for casual writing, and one with Noodler's Walnut or Brown #41 for grading (more interesting than red IMO). I'm a fan of Noodler's inks, especially the longevity and fade resistance for lab notes.