This is the same dark brown clay I used in the “dark smiley” piece. I like the color of the clay body, but it’s rather porous and soaks up glaze. I needed something waxy and opaque to compete with it, and as I learned from the momiji cups, only white satin would do what I wanted it to.
I don’t know what kind of plant this is. It was some sort of weed. I used one photograph as the basis for all the weed cups. Something about the pale plant so clearly highlighted against the dark background made it stand out really well.