Genipa Tincture — Blue-Black of Indigenous Peoples

Harvest genipa fruits (Genipa americana) VERDES and immature. The ripe fruit is edible, but has much less genipin — the active compound. The fruit should be hard and dark green.

Cut the fruits in half and squeeze or grate to extract the juice. Wear gloves — the juice stains intensely any surface. The liquid will be almost colorless to pale green.

Pass the juice through a fine sieve or cloth to remove pulp and seeds. The filtered liquid is your genipa dye.

For body painting: apply the juice directly to clean skin using fingers, twigs or brushes. The Kayapó create geometric patterns representing animals and spirits. The juice is nearly invisible when applied.

The genipin in the juice reacts with amino acids in skin proteins in the presence of oxygen. In 2-4 hours, the mark begins to darken. Full color in 24-48 hours — a deep blue-black.

The genipa mark lasts 1-2 weeks, disappearing naturally as the epidermis renews. It cannot be removed with water or soap — it is a covalent bond with skin proteins.

For dyeing fabrics: works best on protein fibers (wool, silk) because genipin naturally binds to amino acids. For cotton, first treat with tannin to create binding points.

If using cotton or linen: dissolve tannin (8% of fiber weight) in hot water, soak the fiber for 1 hour. Then mordant with alum (12% of weight). For wool/silk, this step is optional.

Submerge the prepared fiber in genipa juice. No heating is necessary — the reaction occurs at room temperature. Leave submerged for 2-4 hours.

Remove the fiber from the bath and hang to air dry. The color develops during drying as genipin oxidizes. Wait 24-48 hours for full color.

After complete oxidation, rinse gently in cold water. The result on wool/silk is intense blue with a slight violet tone. On mordanted cotton, lighter shades of blue.

In Kayapó tradition, genipa (black) and annatto (red) are the two fundamental colors of body painting. Black represents wisdom and connection with spirits; red, vital force and readiness for war. Together, they express the duality of Kayapó cosmovision.