Colours from Kitchen Waste for Textile Dyeing

Why kitchen waste makes sense for dyers

Every week a British kitchen throws away the very things that give the loveliest colour: papery onion skins, spent tea bags, coffee grounds, beetroot peelings and the stones from an avocado. None of them cost anything, none arrive wrapped in plastic, and all of them can be turned into a dyebath on an ordinary hob. You do not need imported dye powder, a dedicated studio or a chemistry set — you need a stainless steel or enamel pan, a wooden spoon you do not mind staining, and a little patience.

The colours will not be the flat, saturated brights of a synthetic dye. They are softer: ochre, olive, dusty rose, warm grey, pale gold. That softness is the point. Each bath is slightly different, and the fibre seems to remember where it came from.

What to save, and how to store it

Keep a paper bag or a jar in the kitchen and add to it as you cook. Anything that has already given its flavour to your dinner is fair game.

• Onion skins — the reliable star. Brown and yellow skins give gold through to amber; red skins give a softer olive-gold and sometimes a greenish bronze on wool.
• Tea bags and loose tea — dry used bags on a radiator or windowsill. Tea is rich in tannin, so it both dyes and helps cellulose fibres hold colour.
• Coffee grounds — dry them before storing or they go mouldy. Expect beige to warm brown, darker on wool.
• Beetroot trimmings — peelings and stalks give a pretty pink, but treat it as a fleeting pleasure; it fades in light.
• Avocado stones and skins — simmered and then left overnight, these give a dusty pink to soft peach.
• Red cabbage leaves — dramatic purple in the pot, disappointing on the line. Fun to experiment with, not to rely on.
• Carrot tops, spinach, pomegranate skins and rhubarb leaves — all worth a try, with pomegranate the most colour-fast of the group.

Dry everything before storing it, or freeze it in a bag. Wet tea bags and coffee grounds in a warm kitchen will grow fur within days.

Making a dyebath without special equipment

Fill a pan with your dye material, cover it with water and bring it to a gentle simmer. Onion skins need about 45 minutes; tea and coffee nearer 30. Strain the liquid into a second pan and you have a dyebath.

A workable starting ratio is roughly equal weights of dye material and dry fibre, though onion skins are generous enough that half the weight will still colour well. If in doubt, use more and simmer for longer — weak baths waste your time and your water.

Soak your fibre thoroughly before it goes in. Dry fibre takes up dye unevenly and can felt if it is wool. Once it is in the pot, keep the temperature steady and stir gently and often. Wool hates sudden changes and rough handling.

Wool, cotton and linen behave differently

Wool is the easy one. It is protein, it grabs colour happily, and a splash of white vinegar in the bath helps. Keep the temperature below about 80°C and never let it boil, or you will shrink and felt it.

Cotton and linen are cellulose, and they are far more reluctant. Wash them first in hot water with soap or soda crystals to strip the sizing and oils, then be prepared for paler results. Two tricks help enormously. First, treat the fibre in a strong tea bath before dyeing — the tannin acts as a bridge between plant fibre and dye. Second, soak cotton or linen in unsweetened soy milk overnight and let it dry before dyeing; the protein in the milk gives the dye something to cling to.

If you are willing to make one small purchase, buy alum. A bag of potassium alum or aluminium sulphate is inexpensive, lasts for years, and lifts the depth and lightfastness of nearly every colour here. Use roughly 10 to 15 per cent of the fibre's dry weight, dissolve it in hot water, and simmer the wet fibre in it for an hour before dyeing.

Shibori patterns with household objects

Shibori is simply resist dyeing, and everything you need is probably already in a kitchen drawer.

• Bound resists — pinch the cloth and wrap an elastic band or string tightly around it, repeating across the fabric, for rings and sunbursts.
• Itajime — fold cloth into a triangle or square, sandwich it between two flat objects such as lolly sticks, jar lids or offcuts of plastic, and clamp with clothes pegs. This gives clean geometric repeats.
• Arashi — wrap cloth tightly around a drainpipe or a bottle, wind string around the whole thing in a spiral, then push the fabric down to scrunch it. Diagonal stripes appear.
• Stitched resist — run strong thread along a drawn line, pull it tight and knot it. The gathered fabric resists the dye and leaves a fine, feathered line.

Wet the cloth before binding. Dry resist gives fuzzy edges; damp cloth gives crisp ones.

Honest expectations, notes and safety

Most kitchen-waste colour is fugitive to some degree. Onion skins, tea and pomegranate hold reasonably well. Beetroot, red cabbage and coffee will fade, especially on a sunny windowsill or through repeated hot washes. Wash finished pieces by hand in cool water with a pH-neutral soap, and dry them in the shade.

Keep a notebook. Record the fibre, its dry weight, what you used and how much, whether you mordanted, the temperature, the time, and the finished colour. Without notes you cannot repeat the good accidents.

Use a dedicated pan for dyeing, or at least one you scrub thoroughly afterwards, and never use the same pan for iron or copper baths. Make iron water by leaving rusty nails in a jar of water with a splash of vinegar for a week; a few drops in a dyebath will sadden onion gold into deep olive and grey, but too much dulls everything and weakens the cloth. Work with good ventilation, keep dye pots away from food preparation, and pour exhausted baths onto the garden — though not the metal ones. Water is precious in a dyebath, so reuse it for a second, paler batch before you tip it away.