Dyeing Red with Dragon's Blood Resin — The Ancient Tree-Sap Pigment of the Spice Trade

Use 30-50% WOF of dragon's blood resin. For 100 g of wool, weigh out 30-50 g of resin. Dragon's blood is sold as lumps, sticks, or powder — lumps and sticks should be crushed to a coarse powder using a mortar and pestle. The resin is hard and brittle, shattering into dark red fragments when struck. The powder should be a deep, vivid red — oxidised or very old resin turns dark brown and gives weaker colour.

Dragon's blood resin does not dissolve in plain water. Add 10 g of sodium carbonate (soda ash) to 4 litres of warm water and stir to dissolve. The alkaline water (pH 10-11) will dissolve the resin. Add the crushed dragon's blood to the alkaline water and stir thoroughly. The water will turn a deep red as the resin dissolves. Some undissolved particles may remain — this is normal. Soak for 2-3 hours with occasional stirring to maximise dissolution.

Bring the pot to 75-80°C and hold for 30 minutes. Heat helps dissolve remaining resin particles. Stir occasionally. The liquid will deepen to a rich, dark red. Do not boil — excessive heat can alter the resin chemistry and produce muddier colours. Strain through muslin cloth if significant undissolved particles remain.

Pre-wet the alum-mordanted wool in lukewarm water for 15 minutes, squeeze gently, and lower it into the dragon's blood dye bath at room temperature. Slowly raise to 75°C over 20 minutes, then hold for 60 minutes. Turn gently every 10 minutes. The wool will develop a warm, translucent red to brick-red — deeper and more brownish than cochineal, with a distinctive resinous quality. The alkaline bath may slightly harden the wool — a brief rinse in mildly acidic water (splash of vinegar) after dyeing restores softness.

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 warm, deep red with a brownish undertone — the colour of ancient lacquer and varnish. Lightfastness is moderate — the resinous pigments are more stable than anthocyanins but less permanent than anthraquinones like madder. Washfastness is fair. Dragon's blood dye has a subtle warmth and depth that reflects its history as one of the most prized pigments of the ancient Spice Road. Dry in shade.