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Swordsmen are known to create "Black Blades", or Kokuto, over time, by using Koka over a sword, which makes the sword much more durable. This can go another level, creating permanent black blades, which are effects of using Haki in a sword over and over again over the course of many battles. They seem to be "forged" with Haki, keeping the black color at all times. These swords are stronger than normal blades, mainly known because of their impressive resilience. Zoro says that even if a dinosaur stepped on it, it wouldn't bend an inch. It is stated that should a swordsman turn their sword into a Black Blade, then its grade would increase in rank.