Walnut ink
From Wikipedia, the free encyclopedia
Walnut ink is an ink made from the green husk surrounding the nut of walnuts. It 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 gypsy communities. Once stained, it is impossible to wash off and remains in the skin for long period of time.
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