Dyeing Orange-Gold with Dahlia — The Aztec Flower That Conquered European Gardens

Use 300-400% WOF of fresh dahlia petals. For 100 g of wool, gather 300-400 g of fresh flower heads. Use orange, dark red, or rust-coloured varieties for strongest dye. Remove the green calyx and stem — use only the coloured petals. Pick flowers at peak bloom. Deadheaded flowers that are beginning to wilt also work well. Frozen petals are effective — freeze surplus flowers during the growing season for dyeing later.

Place the dahlia petals in a dye pot with 4 litres of warm water and soak for at least one hour. The water will turn a warm orange-gold as the flavonoid pigments dissolve. Fresh petals release colour quickly. The colour of the dye bath will closely match the colour of the petals — orange dahlias give orange dye, dark red dahlias give deeper, more russet tones.

Bring the pot to a gentle simmer (75-80°C) and hold for 30 minutes. Stir occasionally. Do not boil — moderate temperatures preserve the clarity of the orange-gold tones. The liquid will deepen to a warm, rich orange. The petals will darken and lose their colour as pigment transfers to the water.

Strain the dye liquor through a fine mesh strainer into a clean pot. Press the spent petals to extract all remaining orange liquid. Petal fragments can stick to wool fibres — strain thoroughly. The strained liquor should be a clear, warm orange-gold.

Pre-wet the alum-mordanted wool in lukewarm water for 15 minutes, squeeze gently, and lower it into the dahlia dye bath at room temperature. Slowly raise to 75-80°C over 15 minutes, then hold for 45 minutes. Turn gently every 10 minutes. The wool will develop a warm orange-gold to burnt orange — an autumnal shade that reflects the colours of the dahlia season. Alum mordanting produces the brightest, most vivid tones.

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 clear. The final colour is a warm orange-gold — the colour of autumn dahlia gardens. Lightfastness is moderate — similar to most flower dyes. The colour will gradually soften toward warmer gold tones with prolonged sunlight exposure. Washfastness is fair with alum mordanting. Dry in shade.