Dyeing Red with Sappanwood — The Asian Heartwood Dye That Preceded Brazilwood

Use 50-100% WOF of sappanwood chips for a medium to deep red. For 100 g of wool, weigh out 50-100 g of chips. Sappanwood is sold as small chips or shavings of the dense, reddish-orange heartwood. The chips should be a deep orange-red colour — pale or yellowish chips come from the sapwood and contain little brazilin. Good quality sappanwood chips stain your fingers red-orange when handled.

Place the sappanwood chips in the dye pot with 4 litres of warm water and soak overnight (8-12 hours). The chips will begin releasing brazilin slowly — the water will turn a deep orange-red during soaking. This pre-extraction step is essential because sappanwood heartwood is dense and releases its dye gradually. By morning, the soaking liquid will be a vivid red-orange.

Bring the pot to a gentle simmer (80-85°C) and hold for 60 minutes. Do not boil — excessive heat dulls sappanwood colour. Stir occasionally. The liquid will deepen to an intensely vivid red, almost opaque. During simmering, the brazilin in the heartwood oxidises to brazilein (the active dye compound). The chips will pale after thorough extraction but can be simmered again in fresh water for a weaker second bath.

Strain the dye liquor through a fine mesh strainer into a clean pot. Squeeze the spent chips to extract all the red liquid. The strained dye bath is a brilliant, clear red — one of the most vivid plant-derived dye baths you will encounter. Wood chips left in contact with the wool during dyeing can cause uneven spots, so strain thoroughly.

Pre-wet the alum-mordanted wool, squeeze out excess, and lower it into the sappanwood dye bath at room temperature. Slowly raise to 80°C and hold for 45 minutes. Turn gently every 10 minutes. Sappanwood dyes best at moderate temperatures — high heat degrades brazilein and shifts the colour toward muddy brown. The alum mordant forms a complex with the brazilein, producing a warm rose-red to crimson on wool.

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 rose-red to soft crimson — beautiful but not as lightfast as madder or cochineal. Sappanwood red will fade noticeably over months in direct sunlight. For items that will see sun exposure, consider overdyeing periodically to refresh the colour. Store dyed items away from UV light for best colour retention. Dry in shade.