Black Hollyhock Flowers
Alcea rosea L. · Natural Dye and Eco-Printing Material
Black hollyhock flowers are an anthocyanin-rich botanical material used for eco-printing, natural dyeing and experimental colour work.
The dried flowers can produce purple, blue-violet, mauve, grey and charcoal-toned impressions. Results vary considerably with the fibre, mordant, pH, water chemistry, temperature and use of iron.
Hollyhock colours are not reliably permanent. They are best suited to botanical printing, sampling, artwork and projects where natural variation and gradual colour change are acceptable.
At a glance
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Botanical name: Alcea rosea L.
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Common names: Hollyhock, black hollyhock and black mallow rose
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Supplier name: Malvae arbor. Flor. tot.
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Plant part: Dried flowers and petals
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Colours: Purple, blue-violet, mauve, grey and charcoal
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Uses: Eco-printing, natural dyeing, botanical printing and colour studies
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Fibres: Wool, silk, cotton and linen
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Mordant: Recommended; use a fibre-appropriate method
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Colour response: Sensitive to pH, water chemistry and iron
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Colourfastness: Poor to moderate
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Vegan: Yes
Colour possibilities
| Method or condition | Possible result |
|---|---|
| Alum mordant | Mauve, purple or blue-violet |
| Iron mordant or modifier | Smoky violet, grey-purple or charcoal |
| More acidic conditions | Pink, red-purple or mauve |
| Neutral conditions | Purple or blue-violet |
| More alkaline conditions | Blue-grey or greenish shifts that may be particularly unstable |
These are possible outcomes rather than guaranteed shades. Sample the flowers with your chosen fibre, water and mordant before beginning a larger project.
Basic eco-printing guide
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Prepare: Scour and mordant the fabric using a method appropriate to the fibre.
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Wet: Wet the prepared fabric thoroughly and squeeze out excess water.
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Arrange: Position the flowers or separated petals on the fabric. Open or flatten whole flowers to improve contact.
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Roll: Fold or roll the fabric tightly around a suitable rod.
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Bind: Secure the bundle firmly with string.
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Steam: Steam using your preferred eco-printing method.
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Cool: Allow the bundle to cool completely before opening.
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Finish: Remove the flower material, allow the print to rest and rinse gently. Dry away from strong sunlight.
Basic dyeing guide
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Prepare: Scour and mordant the fibre using a suitable method, then wet it thoroughly.
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Soak: Cover the flowers with cool water and allow them to soak.
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Extract: Heat gently to release the colour. Avoid vigorous boiling.
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Strain: Strain the liquid through a fine cloth.
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Dye: Add the prepared fibre and heat gently, checking the colour regularly.
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Cool: Allow the fibre to cool in the bath where practical.
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Finish: Rinse gently and dry away from strong sunlight.
Hollyhock is a variable dye material, so no single quantity guarantees a particular shade. Begin with a generous amount, sample first and keep careful notes.
Dyeing cotton, linen or another cellulose fibre? Find suitable mordanting methods here.
Working with iron
Iron can deepen and sadden hollyhock colour, producing smoky purple, grey-violet and charcoal-toned results.
Apply it through an appropriate mordant, printing solution or brief afterbath. Begin with a weak solution and test a small piece before treating the complete project.
Excessive iron can obscure flower detail and make fibres harsh or brittle, particularly wool and silk. Iron changes the immediate colour but does not make anthocyanin-based hollyhock shades reliably permanent.
Tips from the dye pot
| Tip | Details |
|---|---|
| Improve contact | Open or flatten whole flowers and bind the printing bundle firmly. |
| Use gentle heat | Avoid vigorous boiling, which can alter the colour. |
| Test iron first | A small quantity can substantially deepen or grey the result. |
| Watch the pH | Water chemistry and modifiers may cause marked colour shifts. |
| Protect finished work |
Minimise washing and exposure to sunlight. |
| Keep samples | Store dated samples to monitor colour changes over time. |
| Record the process | Note the fibre, mordant, water, pH, iron, temperature and processing time. |
Colourfastness
Black hollyhock flowers contain anthocyanin-type colourants that are sensitive to light, washing, heat and changes in pH.
Colourfastness ranges from poor to moderate. Some carefully prepared prints may remain visible for years when protected from strong light and frequent washing, but permanence cannot be guaranteed.
Iron and suitable mordanting can influence colour retention and appearance, but they do not make hollyhock reliably lightfast or washfast.
Hollyhock is best suited to experimental textiles, botanical prints, artwork and projects where evolving colour is acceptable.
Storage and safe handling
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Store tightly sealed, cool and dry, away from direct sunlight.
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For textile dyeing, botanical printing and craft use only.
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Not for consumption or use in food, drinks, cosmetics or herbal preparations.
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Avoid creating or breathing dust and loose particles.
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Prevent contact with eyes, mouth and open wounds.
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Wear suitable protective equipment when handling dusty material.
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Follow the safety instructions for all mordants, iron solutions and modifiers used.
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Use iron sparingly, as excessive iron can damage fibres.
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Use dedicated dyeing utensils and containersânever food-preparation equipment.
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Keep away from food, children and pets.
For textile dyeing, eco-printing and craft use only - not for consumption.
What you receive
Your chosen net weight of dried black hollyhock flowers, supplied in a pouch.
Natural variation in flower size, shape, colour and fragmentation should be expected.
Mordants, iron, fabric and other printing 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 props are not included.
Learn with us
Join The Natural Dyers & Growers Academy to share your results and explore natural colour alongside fellow dyers, botanical printers and dye-plant growers.
