• Walnut hulls are the outer green shells of walnuts.
• In addition to the plant’s young green leaves, its bark, and roots, especially the outer walnut hulls have been used as dye for coloring textiles and skin for a long time.
• Two species of walnut in particular are noted as historical sources of dyestuffs: The common walnut (also English walnut), Juglans regia L., and the Eastern black walnut, Juglans nigra L. Both belong to the family of the Juglandaceae.
• The principal coloring matters pyrogallol and hydro juglone are found in the outer green walnut shells.
• In an alkaline solution, pyrogallol oxidizes to a brown dye. Hydro juglone, which is mostly found in the dry shells, oxidizes to the generic compound juglone after contact with air.
• In addition to these naphthochinone dyes, walnut shells also contain tannins.
• Since ancient times, walnut hulls have been used to dye wool and other fabric.
• Dried darkbrown hulls make beautiful deep brown hues, while fresh hulls should be soaked in water for 24 hours to increase the amount of the coloring agent juglone.

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