This is a brush that was used for neatly shading the background named Moro-tai (a painting technique) by artists such as Taikan Yokoyama and Shunso Hishida. In addition, it is also suited for painting with a blurry touch.

Kara brush (black) and Sanba brush (brown) are used to get a scratchy pattern, because it's hairs are rough and stiff ? #brush #artsupplies #pigment_tokyo #刷毛 #唐刷毛 #山馬刷毛 #画材

PIGMENT＆T-Art Academyさん(@pigment_tokyo)がシェアした投稿 - 2017 10月 1 12:54午前 PDT