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Pure Matte Black the Hard Way
The best way to get a pure, non-reflective black uses optics, not pigments:

Matte black blade edges The shiny steel blades reflect light just fine, but the reflections have no way back out of the gap between adjacent edges: the angle of reflection always points away from you and the incoming light.
I always admire the blackness when I open that box.
Yes, I’m a member of the Society of the Easily Amused.