YELLOW DOCK ROOT DYE

Dock Yellow Root Natural Dye

Rumex spp. · Cut and Dried · pH-Sensitive Root Dye

Dock Yellow Root produces golden yellow, ochre, peach, coral and muted pink shades depending on the fibre, mordant and pH of the dye bath.

Roots from the Rumex genus contain naturally occurring anthraquinones and related phenolic compounds. Published textile research on particular Rumex species confirms a colour range extending through yellow, yellow-red, red and red-purple.

Because the exact result varies between species and batches, Dock root is best approached as an exploratory natural dye. Pink and coral shades are possible but should not be treated as guaranteed outcomes.

At a glance

• Botanical source: Rumex spp.

• Common name: Dock Yellow Root

• Plant part: Root

• Form: Cut and dried

• Material: Raw botanical dye material—not an extract

• Main colourants: Anthraquinones and related plant phenolics

• Natural colours: Golden yellow, ochre and yellow-brown

• Possible pH shifts: Yellow-red, peach, coral and muted pink

• With iron: Olive-brown, brown and darker earthy shades

• Fibres: Wool, silk, cotton and linen

• Suggested quantity: Approximately 30–50% WOF as a starting point

• Mordant: Recommended

• Colourfastness: Variable; generally medium when suitably mordanted, dyed and finished

• Suitable for vegan projects: Yes

A pH-sensitive anthraquinone dye

Yellow Dock root contains naturally occurring anthraquinones and related phenolic compounds.

Published studies using Rumex crispus root extract successfully dyed both silk and cotton. The colours produced extended across yellow, yellow-red, red and red-purple ranges, with the final shade influenced by pH, mordant, dye concentration, temperature and processing time.

On silk, a dyeing temperature of approximately 70°C produced effective results. On cotton, colour strength increased with concentration, temperature, processing time and repeated dyeing. Mordanting generally improved fastness, although the result depended on the mordant and method used.

This makes Yellow Dock an interesting experimental dye for warm yellows, peaches, corals and muted pinks, as well as darker earthy shades produced with iron.

How much to use

As a starting point, use:

30–50g Dock root per 100g dry fibre

Equivalent to 30–50% WOF - weight of dry fibre.

Use the lower quantity for paler shades or increase it when seeking stronger colour.

There is no universal WOF for every Rumex species. Treat these quantities as practical starting guidelines and sample before working on a larger piece.

Basic dyeing guide

1. Prepare: Scour and mordant the fibre using a suitable method, then wet it thoroughly.

2. Soak: Cover the cut Dock root with water and leave it to soak overnight.

3. Extract: Heat the root and soaking liquid gently at approximately 80–85°C for 45–60 minutes.

4. Strain: Strain the liquid through a cloth. The root may also be contained inside a dye bag and returned to the bath.

5. Dye: Add the prepared fibre and hold the bath at approximately 70–85°C for one hour. Use gentler temperatures for silk.

6. Develop: Allow the fibre to cool in the bath. Leave it overnight where a deeper shade is desired.

7. Finish: Remove the fibre, rinse thoroughly and wash gently.

For wool, approximately 10% alum WOF may be used, or follow your preferred wool-mordanting method.

Dyeing cotton, linen or another cellulose fibre? Find a suitable mordanting method here.

Working with pH

Dock root is sensitive to the pH of the dye bath.

• Acidic to neutral conditions: May favour golden yellow, ochre and warm yellow-red shades

• Increasing alkalinity: May encourage peach, coral, red or muted pink tones

• Result: Depends on the species, fibre, mordant, water chemistry and depth of shade

Adjust the pH gradually and use testing strips. Strong acids and alkalis can damage fibres, while wool and silk require particular care in alkaline conditions.

Pink and coral results should be considered experimental rather than guaranteed.

Colour shifts with iron

Iron can shift Dock root shades towards olive-brown, brown, grey-brown and darker earthy tones.

Use iron sparingly. Approximately 1–3% WOF is generally sufficient when testing these shifts.

We prefer iron acetate where possible because it is gentler on fibres than ferrous sulphate. Excessive iron may dull the colour, make protein fibres feel harsh and contribute to fibre damage over time.

Iron and other modifiers are sold separately.

Tips from the dye pot

Colourfastness

Yellow Dock root can produce medium to good colourfastness when the fibre is suitably prepared, mordanted, dyed and finished.

Published research on Rumex crispus found that mordanting generally improved the fastness of silk, while iron-mordanted cotton showed good lightfastness and washfastness. Results still varied according to the fibre, mordant, pH and dyeing method.

These controlled findings do not guarantee identical performance in every studio. Sample and light-test when permanence is important.

Storage and safe handling

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

• For textile dyeing, paper dyeing and craft use only.

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

• Rumex roots contain biologically active plant compounds, including anthraquinones and naturally occurring oxalates.

• Avoid creating or breathing dust.

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

• Avoid prolonged skin contact and wear gloves.

• Wear eye protection when adjusting the pH of a dye bath.

• Strong acids and alkalis can cause burns and damage fibres.

• Follow the safety instructions for all mordants, acids, alkalis and modifiers used.

• Use iron sparingly; excessive iron can damage fibres.

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

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

• For textile dyeing, paper dyeing and craft use only - not for consumption.

What you receive

Your chosen net weight of cut, dried Dock Yellow Root, supplied in a pouch.

Mordants, pH modifiers, iron and other dyeing supplies are sold separately.

Packaging

We pack as sustainably as we can while protecting your dye materials. Pouch types may vary according to pack size and the availability of our preferred lower-impact options.

Display jars and other photographic props are not included.

Learn with us

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