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gall-nut ink

noun

Definitions

  1. acid blue-to-black ink, blue or purple when fresh, but turning intense black from iron…

    acid blue-to-black ink, blue or purple when fresh, but turning intense black from iron oxidation, containing iron ions and tannic acids obtained from crushed gall-nuts and a solution of gum, or glue, and copperas, slowly replaced carbon ink and used from late antiquity to 20th century

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Vish — recursive loop

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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA