Dyeing with Elderberries — Fugitive Purple from the Hedgerow

Use 200-300% WOF of fresh elderberries, or 100% WOF of dried. For 100 g of wool, gather 200-300 g of fresh ripe berries or 100 g of dried elderberries. The berries must be fully ripe — deep purple-black, not red or green. Unripe berries contain less anthocyanin and produce weaker, duller colour. Strip the berries from their stems by running a fork through the clusters, and remove as much stem as you can: except for the flowers and ripe berries, all parts of the elder, including the stems, leaves and seeds, contain a cyanogenic glycoside and are poisonous raw. Do not eat from the dye bath, and use a pot and tools kept for dyeing only. The juice also stains hands intensely, so wear gloves.

Place the berries in the dye pot with about 4 litres of water. Heat to about 80°C, below a simmer, and hold for 45 minutes, mashing the berries occasionally with the stirring spoon to release more juice. The liquid will turn an intense, opaque purple — one of the most dramatic dye baths in natural dyeing. Do not boil vigorously — high heat degrades anthocyanins and shifts the colour toward muddy brown.

Strain the dye liquor through a fine mesh strainer into a clean pot, pressing the pulp to extract all the purple liquid. The strained bath should be a deep, vivid purple — almost black in concentration. Discard or compost the spent pulp. The colour of this bath is deceptively beautiful — it looks like it could produce permanent purple, which is precisely the lesson elderberry teaches.

Let the strained dye bath cool to room temperature. Pre-wet the alum-mordanted wool, squeeze out excess, and lower it into the bath. Slowly raise to 80°C and hold for 45 minutes, turning every 10 minutes. The wool will take up the purple quickly. The skein will emerge a rich, deep purple-violet that looks magnificent while wet.

Let the wool cool in the bath overnight, then remove and rinse in lukewarm water. The rinse water will run purple — more colour washes out than with well-fixed mordant dyes like madder or cochineal, which is the first sign of elderberry's fugitive nature. The dried wool will be a soft lavender-purple, lighter than expected from such a dark dye bath. Hang in shade to dry.

Cut the dried skein in half. Store one half in a dark drawer. Pin the other half to your sunniest window. Compare the two samples side by side after two weeks and again after a month. The window sample will fade, from purple toward grey or brownish tones, and the difference grows the longer it hangs. This is the core lesson: elderberry anthocyanins are pH-sensitive, photosensitive, and weakly bonded. No mordant makes it lightfast — the pigment molecule itself is unstable. Understanding this principle saves the dyer from wasting expensive fibre on other fugitive dyes (fresh blackberry, red cabbage, beetroot) that produce vivid but impermanent colour.