Red Star Brand Four-Shaku Cotton Heavy Single Xuan, Hansetsu

"Ink's expressive power varies depending on the thickness of the paper"

The writing feel varies slightly depending on the thickness of the paper.
The thicker the paper, the deeper the ink penetrates. This creates depth in the ink color and makes it easier to express strength.
On the other hand, because it absorbs ink well, brush movements can be heavy.
It requires a larger amount of ink, and at the same time, it tends to be more prone to smudges.

Thinner paper allows the ink to reach the back of the paper more easily, making it easier to create sharp writing.
Also, because it absorbs ink less well than thicker paper, brush movements can be lighter.

Cotton-based heavy-duty paper is made slightly thicker than cotton-based paper, resulting in a deeper ink color.