Does not fade.

According to a search on Sohu.com, we learned that buckwheat husks will not fade when wrapped in white cloth. Buckwheat is an annual herbaceous dicotyledonous plant. Its seed shell is black or gray, but it will not stain or fade white fabrics. Therefore, wrapping buckwheat husks in white cloth will not cause the color to fade.

Buckwheat hull refers to the outer shell of buckwheat. It is a common Chinese medicinal material and the seed of buckwheat, a plant of the Polygonaceae family.