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Best black eh? It depends on what "shade" of black you like and what properties are important to you? Many would swear by Noodler's Black which is waterproof on poor paper, but will smear on good paper because not all the ink gets into the paper. It can also leave black stuff in your pen. I just switched over to Platinum Carbon Black as my "official" waterproof black, but it has carbon pigments that require good pen hygiene. It can also feather and bleed on really bad paper. Probably the most hassle free inks with decent water resistance are Pelikan 4001 Brilliant Black and Herbin Perle Noir. Between those 2 the Herbin is "blacker" and more saturated, so I prefer it.
So for me, long story short: Noodler's Black if I need waterproofness on absorbant cheap paper, Platinum Carbon Black if I need waterproofness on decent paper, and Herbin Perle Noir if I need black for any other reason, including in vintage pens.