皮 Bam Kkeopjil (밤 껍질)

Original, read line by line 東醫寶鑑 · Tangaek — Decoctions vol. 2

1. 名扶, 卽栗子上皮也. 和蜜塗人, 令急縮, 可展老人面皮皺. 《本草》

   It is named bu (扶), and it is the skin on the outside of the chestnut. Mixed with honey and applied, it makes the skin draw in tightly and can smooth the wrinkles on an old person's face. 《Boncho (本草)》

   HomiclubThis names the skin that wraps the chestnut. A chestnut has two layers: under the hard outer shell there remains a thin, astringent inner skin called bonui.