Dyeing Red-Orange with Bloodroot — The Sacred Dye of Pre-Columbian America

Use 50-100% WOF of dried bloodroot rhizome. For 100 g of wool, weigh out 50-100 g of dried root. Dried bloodroot rhizome is sold as dark reddish-brown pieces with a distinctive orange-red interior when broken. IMPORTANT: Put on nitrile or rubber gloves before handling the root — sanguinarine stains skin bright orange and can cause irritation or chemical burns with prolonged contact. Work in a well-ventilated area or outdoors. Chop or break the dried root into small pieces (1-2 cm) using a dedicated cutting board that you do not use for food.

Place the chopped bloodroot pieces in a dye pot with 4 litres of warm water and soak overnight (8-12 hours). Cover the pot — sanguinarine is light-sensitive and the soak should happen in a dark or covered environment. The water will turn a vivid orange-red within the first hour as sanguinarine dissolves. By morning, the liquid will be an intensely coloured red-orange. Keep gloves on when handling the pot or any splashed liquid — the dye stains everything it touches.

Wearing gloves, bring the pot to a gentle simmer (75-80°C) and hold for 45 minutes. Do not boil — sanguinarine degrades at high temperatures, dulling the colour from vivid red-orange to muddy brown. Work in a well-ventilated area as the steam carries traces of the alkaloid. Stir occasionally with a dedicated spoon. The liquid will deepen to an intense red-orange. The root pieces will pale as they release their pigment.

Strain the dye liquor through a fine mesh strainer into a clean pot. Wear gloves throughout — the spent root and liquor are both staining and irritating. Press the root pieces gently to extract remaining liquid. Dispose of spent root pieces carefully — do not compost where children or animals might contact them. The strained liquor should be a brilliant, clear red-orange.

Pre-wet the alum-mordanted wool in lukewarm water for 15 minutes, squeeze gently, and lower it into the bloodroot dye bath at room temperature. Slowly raise to 75°C over 20 minutes, then hold for 45 minutes. Turn gently every 10 minutes using gloves. The wool will develop a warm red-orange — vivid and saturated when fresh. The alum mordant helps fix the sanguinarine to the wool fibre, improving washfastness. Without mordant, the colour washes out significantly. Iron modification shifts the colour toward dark brown-red.

Turn off the heat and let the wool cool in the dye bath overnight. Wearing gloves, remove the wool, squeeze gently, and rinse in lukewarm water until the runoff is mostly clear. The rinse water will be orange — dispose of it safely, not where it could contact food-growing soil. The final colour is a warm red-orange, reminiscent of the autumn woodland floor where bloodroot grows. Lightfastness is moderate — the colour will fade toward pale orange with prolonged sunlight exposure, similar to annatto. For this reason, Indigenous dyers favoured bloodroot for items stored indoors or worn intermittently. Dry thoroughly in shade. Clean all pots, strainers, and tools that contacted the dye bath before returning them to kitchen use — or better, dedicate them to dye work permanently.