noun
stump; blending stump; tortillon
A tightly rolled paper or felt tool used in drawing to blend or smudge pencil, charcoal, or pastel. Also called 掠り筆 (かすりふで).
See also: 掠り筆
デッサンで擦筆を使って影をぼかす。
I use a blending stump to soften shadows in my drawing.
擦筆は紙を巻いて作ることもできる。
You can also make a blending stump by rolling paper.