Tangaek — Decoctions · Trees

秦皮 Mupeuretgeopjil (무프렛겁질)

Jinpi is the bark of the Korean ash. Its old Korean name, mupeuretgeopjil, means simply 'ash bark', and the Korean name of the tree comes from the blue-green colour its bark bleeds into water. Dongui Bogam gives that as the test of a genuine piece: write on paper with the soaked water and the mark should come out blue.

Original, read line by line 東醫寶鑑 · Tangaek — Decoctions vol. 3

  1. 性寒, 味苦, 無毒.

    Its nature is cold, its taste bitter, and it is without toxicity.

  2. 主肝中久熱, 兩目赤腫疼痛, 風淚不止.

    It governs long-standing heat in the liver, redness, swelling and pain in both eyes, and unceasing tearing in the wind.

  3. 除目中靑瞖白膜, 洗眼益精明目.

    It removes qingyi (green eye film) and white membrane within the eye, and washing the eyes with it boosts essence and brightens vision.

  4. 療熱痢, 婦人帶下, 小兒癎熱.

    It heals heat dysentery, women's vaginal discharge, and jianre (fright fever) in children.

  5. 處處有之, 樹似檀.

    It grows everywhere, and the tree resembles tan, the Korean birch.

  6. 葉細, 皮有白點而不麄錯.

    The leaves are slender, and the bark carries white specks without being coarse or crosshatched.

  7. 皮有白點, 故俗呼爲白樳木.

    Because the bark has white specks, it is commonly called baeksimmok, the white-speckled tree.

    HomiclubThe ash tree's bark carries pale blotches visible from a distance. Its Korean name mulpure means water-bluing, from the way a soaked twig tints the water. The same genus supplies the ash timber used for baseball bats and furniture.

  8. 二月八月採皮, 陰乾.

    The bark is stripped in the second and eighth months and dried in the shade.

  9. 取皮水漬, 便碧色, 書紙看靑色者, 眞也. 《本草》

    Steeped in water the bark at once turns blue-green; writing with that water on paper and finding the strokes blue proves it genuine. 《Bencao》

    HomiclubA fluorescent compound leaches from the bark and makes the water glow blue. This old test for genuine bark still gives the same result today.

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This is a cultural and historical record from a classical text, not a claim about any food’s effects. Nothing here is a health supplement or intended to prevent or treat disease. Consult a medical professional about health concerns. · Text: Korean Medicine Classics DB · Reading: Homiclub