Walnut ink is an ink made from the green husk surrounding the nut of walnuts. The Black Walnut Juglans nigra is usually used. The ink may be liquid or made of crystals that are mixed with water before use. It can be used to produce stains and darken paper to make it look older.
An ancient use of walnut ink was to stain the hands of criminals in Romani communities. Once stained, it is impossible to wash off and remains in the skin for long period of time.
- "Black Walnut Ink Workshop". Guild of Natural Science Illustrators. October 2002. Retrieved 3 July 2014.
- de Nevell, Elizabeth. "Making Walnut Ink".
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