Dyeing Pink-Mauve with Hibiscus — The Tropical Flower Dye of Ancient Egypt

Use 100-200% WOF of dried hibiscus calyces. For 100 g of wool, weigh out 100-200 g of dried calyces. These are sold as hibiscus tea, 'flor de Jamaica', or 'karkade' in grocery stores and tea shops. The calyces should be a deep, vivid red-purple — pale or brownish calyces are old and give weak colour. Whole calyces give a cleaner dye bath than pre-ground tea.

Place the dried hibiscus calyces in a dye pot with 4 litres of warm water and soak for 2-3 hours. The water will turn a vivid crimson-red within minutes as the anthocyanins dissolve rapidly from the thin, papery calyces. Hibiscus releases dye much faster than bark or root sources. By the end of soaking, the liquid should be a deep, clear ruby-red.

Bring the pot to 70°C and hold for 20 minutes. Do not exceed 75°C — anthocyanins degrade at high temperatures, shifting the colour from pink toward dull brown. Hibiscus extracts so readily that a short, gentle simmer is sufficient. Stir occasionally. The liquid will remain a vivid red. The calyces will have paled to a dull pinkish-brown as their pigment transfers to the water.

Strain the dye liquor through a fine mesh strainer into a clean pot. Press the spent calyces gently to extract remaining liquid. The calyces become soft and slimy during soaking — strain thoroughly to avoid fragments sticking to the wool. The strained liquor should be a clear, vivid red.

Pre-wet the alum-mordanted wool in lukewarm water for 15 minutes, squeeze gently, and lower it into the hibiscus dye bath at room temperature. Slowly raise to 65-70°C over 15 minutes, then hold for 45 minutes. Turn gently every 10 minutes. The wool will develop a soft pink to dusty mauve — the red of the dye bath translates to a gentler, more muted pink on the fibre. The alum mordant produces the clearest pink tones and improves washfastness.

Turn off the heat and let the wool cool in the dye bath overnight. Remove, squeeze gently, and rinse in lukewarm water until the runoff is mostly clear. The final colour is a soft pink to dusty mauve — warm and gentle, with the same family of tones as the hibiscus tea the calyces are more commonly used for. Lightfastness is moderate — the pink will soften with sunlight exposure. Washfastness is fair with alum mordanting. Dry in shade.