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.
- "Black Walnut Ink Workshop". Guild of Natural Science Illustrators. October 2002. Retrieved 3 July 2014.
- Parker, Dian (14 June 2012). "Chelsea Library Shows Paintings Of an Important New Talent". The Herald. Randolph, Vermont. Retrieved 19 October 2017.
- de Nevell, Elizabeth. "Making Walnut Ink".
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