Relating to or containing gallotannin, a compound found in plant galls that is used for tanning and dyeing.
From gallotannin plus the adjectival suffix -ic, creating an adjective form describing something that has the properties or contains gallotannins.
Gallotannic acid is why medieval manuscripts could last 1,000 years—iron gallotannate ink literally bonded to parchment at a molecular level, which is why medieval books are often better preserved than 200-year-old paper documents.
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