The Appeal of the Kitchen Dyepot

There is a particular pleasure in turning kitchen scraps into colour. A spoonful of turmeric, a bag of beetroot, the outer leaves of a red cabbage — all hold pigment that will bond, however loosely, with protein fibres such as wool. For the hand spinner with a fleece to use up, or the knitter after a skein that matches a favourite jumper, the kitchen dyepot is an inviting place to start.

It is also a place where expectation and reality part company. Kitchen dyes are beautiful, but most are what dyers call fugitive: their colours fade in sunlight, shift in the wash, or both. That is no reason to avoid them. It is a reason to test small samples, keep notes, and treat the results as an experiment rather than a guaranteed recipe.

Getting the Wool Ready

Wool must be clean before it will take dye evenly. Scour your skeins in warm water with a little mild washing-up liquid or soap flakes, rinse until the water runs clear, and handle them gently — agitation plus heat equals felt.

Most kitchen dyes work best on mordanted wool. Alum is the usual choice: around 10% of the weight of the dry fibre, plus a pinch of cream of tartar, simmered with the wool for an hour and left to cool overnight. You can skip the mordant for turmeric, which stains readily, but beetroot and red cabbage will reward the extra step.

Whatever the dye, keep the temperature below a simmer — 80 to 85°C is plenty — and let the wool cool in the bath. Sudden temperature changes shock the fibres and cause dye to strike unevenly.

Turmeric: Bright, Easy, Fleeting

Turmeric is the most generous of the kitchen dyes. Two tablespoons of ground turmeric in four litres of water will dye 100g of wool a strong, clear yellow, and it needs no mordant to make an impression. Stir it into the water, bring it up to temperature, add the damp wool, and hold it there for 30 to 45 minutes, stirring only occasionally.

The catch is light. Turmeric yellow is famously unstable — a sunny windowsill will strip it back within weeks, and even indoor light dulls it over a season. It can also transfer onto hands and neighbouring fabrics. Use it for projects that live indoors, and consider overdyeing with a little madder or onion skin for more staying power.

Beetroot: Vivid in the Pan, Modest on the Skein

Beetroot promises a deep, jewel-like pink and rarely delivers it. Its pigment, betanin, is a poor match for wool: it sits on the surface rather than bonding, and much rinses away. What remains is usually a soft, dusty rose or pale peach rather than the magenta you saw in the pan.

• Use roughly 500g of chopped raw beetroot, or peelings, per 100g of wool.
• Simmer the beetroot for an hour first, strain, then add the wool to the liquor.
• Add 50ml of white vinegar per litre of water to encourage pink rather than a brownish tone.
• Expect a result two or three shades paler than the dyebath, and test for lightfastness before using it on anything precious.

Red Cabbage: A Colour That Answers to Chemistry

Red cabbage contains anthocyanins, the same family of pigments that colour blueberries and cherries — and they are wonderfully responsive to pH. One dyebath will give you pink, violet, blue or soft green depending on what you add.

Simmer chopped cabbage in water for an hour, strain, then add your mordanted wool. An acid bath — a good glug of vinegar — pushes the colour towards pink and magenta. A neutral bath gives lavender and blue. A pinch of bicarbonate of soda in the rinse water shifts it towards green, though too much alkali will damage wool and leave it feeling harsh.

As with beetroot, red cabbage colour fades. Treat the results as seasonal rather than permanent, and enjoy them for what they are.

Test, Record, Repeat

The most useful habit in kitchen dyeing is to work on 10g samples before committing your yarn. Knit or crochet them into small squares, then:

• Wash one in warm water with your usual wool wash and see how much colour rinses out.
• Leave another on a sunny windowsill for a fortnight and compare it with a control kept in a drawer.
• Note the weight of fibre, the weight of dye, the mordant, the temperature, the time and the pH.

A simple notebook is enough, and it will save you from repeating a disappointment or, better still, from failing to repeat a success. Kitchen dyes are variable by nature — the same cabbage bought in June and December will not give quite the same blue — but careful notes will get you close.

Start small, keep the pan below a simmer, and let the wool cool slowly. The colours you coax from the kitchen will not last forever, but they will be entirely your own.