Charcoal
"But... if no one has ever been able to find Shusaku, how can I find him? I don't even know what he looks like, nor do I have any clue as to where he might be," Yoichi replied, touching his chin and beginning to think of a solution.
The profession of the blacksmith was very common in Tentochu, and it certainly numbered thousands and thousands of skilled workers. However, if Ryutaro was insisting on Shusaku's figure, there had to be a particular reason.
Yoichi also thought about the sword hanging on the wall of the Dojo's highest room. The chrome-plated blade and the perfect finish, the designs on the hilt, and the stability of the handle with the orange laces: if the image of that sword had stuck in the young tamer's mind, there was a reason. Its appearance had impressed Yoichi, who, though not a weapons expert, could appreciate its incredible workmanship.