Iron Gall Ink Revisited: Natural Formulation for Black Hair-Dyeing

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Sang Yeong Han; Seok-Pyo Hong; Eunhye K. Kang; Beom Jin Kim; Hojae Lee; Won Il Kim; Insung S. Choi;

Inspired by the iron gall ink that has been used since the Middle Ages, we formulated a hair-dyeing solution for blackening hair. The ingredients in the formulation have been approved as cosmetic ingredients, including tannic acid, gallic acid, and Fe(<span style="font-... View more
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