tokusa

Tokusa(木賊・砥草) or scouring rush is necessary for kintsugi work. To curve lacquer clay or to file off the overrun of lacquer, using sandpaper sometimes would damage the surface of ceramics. But if you use tokusa instead, you don't have to worry about that.

Ms Ma gave me tokusa in her front yard, that I boiled with a bit of salt and dried.