Zoro recently (in the anime) unleashed an impressive torrent of attacks using Busoshoku (Armament) Haki infused blades. This was not all that surprising but his flashback was (to me).
Zoro flashed back to both his training with Dracule Mihawk and his fight with him in the Baratie arc. Mihawk's main blade, Yoru apparently, is clearly shown to be black throughout this fight and the flashback stresses the fact that it is the strongest Black Blade. Yet, the episode seems to say that Black Blades refer to swords turning black when infused with Haki. As Mihawk is the strongest swordsman, it seems guaranteed that the world's strongest "Black Blade" may or may not have anything to do with Yoru's color itself.
In addition, you can note that both replicas of Yoru we see (Mihawk's mini sword and the one wielded by the Mihawk-like monkey Zoro trained against) have silver blades.
This all leads to 3 closely inter-related questions:
- Did I understand this right? Does "Black Blade" refer to the sword or the technique?
- Did Mihawk use Haki on Zoro so early in the series?
- Does Yoru (as we've seen it but in universe) look black, silver, or does it vary from person to person? What if Yoru is not wielded by Mihawk?