Horse Chestnut Leaf Natural Dye

Aesculus hippocastanum L. · Cut or Ground

Horse chestnut leaves are a seasonal European botanical dye material producing soft yellow, straw, green-gold, muted olive, khaki and light brown shades.

Horse chestnut leaves generally produce yellow-based, olive or earthy shades. Iron can shift these colours towards grey-green, deeper khaki and grey-brown.

Choose cut leaves for slower extraction and easier straining, or ground leaves for quicker and more thorough colour release.

At a glance

Horse chestnut leaves as a dye material

Horse chestnut is a large deciduous tree native to southeastern Europe and now widely planted throughout Ireland, Britain and continental Europe.

Its distinctive palmate leaves contain naturally occurring tannins, flavonoids and other plant compounds. Their proportions change throughout the growing season, so the colour and strength of the dye can vary noticeably according to the time of harvest, growing conditions, drying and storage.

Horse chestnut leaves can produce useful seasonal colours, particularly when their natural variation is treated as part of the dyeing process.

They should not be considered a standardised tannin source. Although the leaves contain naturally occurring tannins, their tannin strength is not predictable enough to replace a measured tannin such as Gallnut or Tara when reliable cellulose preparation is required.

Understanding the possible colours

Dried horse chestnut leaves may produce pale yellow, straw, green-gold, muted olive, khaki, tan or light brown.

Iron can shift yellow and olive shades towards grey-green, deeper khaki and grey-brown. Excessive iron may overwhelm the underlying leaf colour and produce a dull or very dark result.

The final shade depends on:

• The season and maturity of the leaves

• Drying and storage

• Cut or ground form

• Quantity of dye material

• Fibre preparation

• Mordant

• Water chemistry

• Extraction temperature and time

• Length of time in the dye bath

• Use of iron or other modifiers

Clear or bright green should not be expected from horse chestnut leaves alone.

Choosing a form

Cut horse chestnut leaves

• Suitable for soaking and longer extractions

• Easier to contain and strain from the dye bath

• Produce less sediment than the ground form

• May be extracted again for a paler second bath

• Well suited to slow, traditional dye-bath preparation

Ground horse chestnut leaves

• Greater surface area encourages quicker extraction

• Can release the available colour more thoroughly

• Produce considerably more sediment

• Best contained in a closely woven cloth or fine dye bag

• Require regular stirring to prevent settling and scorching

The ground form is made from the same dried horse chestnut leaves. It is not a concentrated extract.

How much to use

For a medium shade, begin with:

100g horse chestnut leaves per 100g dry fibre

Equivalent to 100% WOF - weight of dry fibre.

For stronger olive, khaki or light brown shades, use:

150–200g horse chestnut leaves per 100g dry fibre

Equivalent to 150–200% WOF.

Ground leaves offer the best chance of extracting the available colour thoroughly. Cut leaves require a longer soak and extraction.

These quantities are starting points. The final result depends on the particular batch, season of harvest, fibre, mordant, water chemistry and dyeing method.

Suggested dyeing method

1. Prepare: Scour and prepare the fibre using a method appropriate for the fibre type. Wet it thoroughly before dyeing.

2. Soak: Cover the horse chestnut leaves with water and leave for several hours or overnight. Use enough water to cover the material while keeping the bath reasonably concentrated.

3. Extract: Heat gently at approximately 80–90°C for one hour. Avoid vigorous boiling.

4. Strain: Strain the liquid carefully. Ground leaves are best contained inside a closely woven dye bag or strained through a fine cloth.

5. Dye: Add the prepared fibre and hold the bath at approximately 80–85°C for one hour.

6. Deepen: Allow the fibre to cool in the bath. For stronger colour, leave it overnight or repeat the dyeing process in a fresh bath.

7. Finish: Rinse thoroughly and wash gently with a pH-neutral soap.

The result may range from pale yellow and straw to green-gold, muted olive, khaki, tan or light brown.

Dyeing cotton, linen or another cellulose fibre? Find our cellulose mordanting guide here.

Tips from the dye pot

Working with iron

Horse chestnut leaf dye can be modified with iron to create grey-green, deep khaki and grey-brown shades.

Begin with approximately:

0.5g iron per 100g dry fibre

Equivalent to 0.5% WOF - up to 3%.

Dissolve the iron thoroughly before adding it to the dye bath or prepare a separate iron afterbath. Add the fibre briefly and watch the colour as it changes.

Remove the fibre when the desired shade has been reached. Iron continues to darken the colour and should be used sparingly.

Too much iron may:

• Overwhelm the original leaf colour

• Produce a dull or very dark result

• Make wool and silk feel harsh

• Weaken natural fibres over time

An iron afterbath gives greater control than adding an unmeasured quantity directly to the main dye bath.

Colourfastness

Horse chestnut leaves generally produce medium colourfastness.

Leaf dyes are often softer and less lightfast than dyes obtained from bark, roots or concentrated extracts. Performance depends on the fibre, preparation, mordant, depth of shade, water chemistry, extraction method and aftercare.

Mordanting can improve colour uptake and durability but does not guarantee high lightfastness.

Iron-modified shades may appear deeper and more resistant, although excessive iron should be avoided.

Protect finished textiles from prolonged direct sunlight and wash them gently with a pH-neutral detergent.

Horse chestnut leaf dye is particularly suitable for exploratory work, seasonal colour studies, botanical printing, sampling and textiles that will not be exposed continuously to strong sunlight.

Natural variation

This is a natural botanical material. Colour, particle size and dye strength may vary between batches according to the season of harvest, leaf maturity, growing conditions, drying, storage and processing.

Cut material may contain small pieces of stem or other harmless parts of the plant.

Storage and safe handling

• Store sealed in a cool, dry place away from direct sunlight.

• For textile dyeing, paper and craft use only.

• Not for consumption or use in food, drinks, cosmetics or herbal preparations.

• Horse chestnut leaves contain naturally occurring saponins, coumarins and other biologically active plant compounds.

• Avoid creating or breathing dust, particularly when handling the ground form.

• Work in a well-ventilated area when handling ground material.

• Wear a suitable dust mask when measuring or transferring the ground leaves.

• Prevent contact with the eyes, mouth and open wounds.

• Wear suitable protective equipment when handling dusty material, dye baths and modifiers.

• Follow the safety instructions for every mordant and modifier used.

• Use dedicated dyeing utensils and containers - never food-preparation equipment.

• Keep away from food and out of reach of children and pets.

What you receive

Your chosen net weight of dried horse chestnut leaves in either cut or ground form, supplied in a pouch.

Mordants, modifiers and other dyeing supplies are sold separately.

Display jars and photographic props are not included.

Learn with us

Join The Natural Dyers & Growers Academy to share your results and explore natural colour alongside fellow dyers and growers.