The Plant Dyeing Process: How We Create Color Without Chemicals

The Plant Dyeing Process: How We Create Color Without Chemicals

Most clothing is colored with synthetic dyes—petroleum-based chemicals that pollute waterways, require heavy metals as fixatives, and persist in the environment for decades. The fashion industry is responsible for up to 20% of global water pollution, and textile dyeing is a major culprit.

Plant dyeing offers a radically different approach: color created from renewable botanical materials using processes that return safely to the earth.

At Herderin, every plant-dyed garment goes through a careful, time-intensive process that produces color without chemical pollution. Here's how it actually works—and why the natural variation you see in each piece is a feature, not a flaw.

What Is Plant Dyeing?

Plant dyeing (also called natural dyeing or botanical dyeing) uses pigments extracted from roots, leaves, bark, flowers, and other plant materials to color fabric. Humans have been dyeing textiles with plants for thousands of years—indigo from the indigofera plant, madder root for reds and oranges, walnut hulls for browns.

Unlike synthetic dyes invented in the 1850s, plant dyes:

• Come from renewable resources that can be sustainably grown or harvested
• Break down naturally without leaving toxic residue
• Don't require petroleum or heavy metal mordants (in most cases)
• Create subtle, complex colors with depth and variation
• Support biodiversity when sourced from diverse plant ecosystems

Plant dyeing isn't about nostalgia or romanticism—it's about using materials that work with natural systems instead of against them.

The Plants We Use

Different plants create different colors through distinct chemical compounds. Here are the primary botanicals we work with:

Walnut (Juglans regia)

• Color created: Rich, warm browns ranging from camel to espresso to deep chocolate
• Part used: Hulls (the green outer covering of the walnut)
• Process: Walnut hulls are simmered to extract tannins, which bond naturally with protein fibers like wool and silk
• Why we love it: Creates earthy, tonal browns that deepen with wear and age beautifully

Indigo (Indigofera tinctoria)

• Color created: Deep blues ranging from bright cerulean to dark navy
• Part used: Leaves (fermented to create indigo paste)
• Process: Indigo requires a reduction vat (oxygen-free environment) where fabric is dipped multiple times, oxidizing to blue when exposed to air
• Why we love it: One of the few natural dyes that creates true blues; develops beautiful fading and patina over time like raw denim

Madder Root (Rubia tinctorum)

• Color created: Reds, oranges, and coral tones depending on pH and fiber
• Part used: Dried roots ground into powder
• Process: Roots are simmered to extract alizarin, the red pigment compound
• Why we love it: Creates warm, saturated colors that are surprisingly lightfast for a natural dye

Other Botanicals We also work with logwood, cutch, pomegranate, and other plant materials depending on the color and fiber being dyed. Each plant has unique chemical properties that interact differently with different fabrics.

The Dyeing Process: Step by Step

Plant dyeing isn't as simple as boiling fabric in colored water. Here's what actually happens:

1. Scouring (Preparation)

Before dyeing, fabric must be thoroughly cleaned to remove any oils, dirt, or finishes that would prevent dye absorption. We use gentle, plant-based soaps and hot water.

For protein fibers like wool and silk: scouring in warm water with pH-neutral soap For cellulose fibers like cotton: may require additional preparation with soda ash

Clean fiber accepts dye evenly.

2. Mordanting (When Needed)

Some natural dyes need a mordant—a substance that helps pigment bond permanently with fiber. We use aluminum acetate or aluminum sulfate when necessary, which are considered safe mordants with minimal environmental impact.

Not all dyes require mordants:

• Walnut is high in tannins and bonds naturally with protein fibers
• Indigo chemically bonds without mordants
• Some plants do need mordanting for colorfastness

The mordanting bath involves simmering fabric in the mordant solution, then rinsing thoroughly.

3. Dye Extraction

The plant material is simmered (not boiled) to extract pigment compounds into water. This creates the dye bath.

Temperature and time vary by plant:

• Walnut hulls: 1-2 hours at 180°F
• Madder root: 1 hour at 160-180°F (higher temps can shift color toward brown)
• Indigo: fermentation process, not heat extraction

We strain out plant solids, leaving concentrated dye liquid.

4. Dyeing

Clean, mordanted (if needed) fabric enters the dye bath. The fabric is gently moved through the liquid, ensuring even saturation while the dye molecules bond with fiber.

Dyeing time: 30 minutes to several hours depending on:

• Desired color depth
• Fiber type
• Plant material
• Water pH and mineral content

For indigo: multiple brief dips with air oxidation between each dip, building color gradually

The fabric changes color as you watch—a kind of quiet magic that never gets old.

5. Rinsing and Oxidation

After dyeing, fabric is rinsed in progressively cooler water until water runs clear. This removes excess dye that didn't bond and prevents bleeding later.

For indigo: air exposure completes the oxidation process, turning the fabric from yellow-green to blue.

6. Drying

Fabric is hung to dry away from direct sunlight. Some colors continue to develop or shift slightly as they dry and cure.

Why Every Piece Is Unique: Understanding Natural Variation

Here's what's important to understand about plant dyeing: natural variation isn't a defect—it's proof of an authentic, non-industrial process.

Synthetic dyes aim for perfect uniformity. Every garment in a production run is exactly the same color. This requires precise chemical formulas, controlled conditions, and industrial dyeing equipment.

Plant dyes create variation because they're working with living systems. Factors that affect final color include:

Plant material variation:

• Where the plant grew (soil, climate, rainfall)
• When it was harvested
• How it was stored and processed
• Natural variation in pigment concentration

Water chemistry:

• Mineral content in water
• pH levels
• Hardness or softness

Dyeing conditions:

• Exact temperature (even 10 degrees matters)
• Length of time in dye bath
• How fiber is moved through the bath
• Atmospheric pressure and humidity

Fiber characteristics:

• How the wool or cotton was processed
• Natural variation in protein or cellulose structure
• Age of the fiber

Result: No two dye baths create exactly the same color, and within a single dye bath, different parts of the fabric may absorb dye slightly differently.

This creates:

• Subtle shifts in saturation across the garment
• Tonal variation that adds depth
• Unique color character in each piece

You're not getting a flawed version of a perfect standard—you're getting one unique piece from a living process.

Garment Dyeing vs. Fiber Dyeing

At Herderin, we primarily use garment dyeing—dyeing completed garments rather than fabric yardage or raw fiber.

Why garment dyeing matters:

1. Allows precise color control: We can test colors on completed garments and adjust 2. Creates unique character: Seams, hems, and construction details create subtle dye variation 3. Soft, lived-in hand: Garment dyeing creates a soft, broken-in feel from the start 4. Reduces waste: We dye exactly what's needed rather than yardage that might not be used

The trade-off: Garment dyeing is slower and more labor-intensive than dyeing fabric in bulk. But it aligns with our commitment to small-batch, made-to-order production.

The Environmental Case for Plant Dyes

The contrast between plant and synthetic dyeing is stark:

Synthetic Dyes:

• Petroleum-based (fossil fuel dependent)
• Require heavy metal mordants (chromium, copper) that contaminate water
• Release toxic compounds like azo dyes, which break down into carcinogens
• Persist in the environment—don't biodegrade
• Contribute to 20% of industrial water pollution globally
• Cause health problems for textile workers exposed to chemicals

Plant Dyes:

• Renewable resource (can be sustainably grown/harvested)
• Use minimal, non-toxic mordants or none at all
• Completely biodegradable—return safely to soil and water
• Support plant biodiversity when sourced responsibly
• Safe for dyers and wearers (no toxic exposure)
• Require less energy (no industrial chemical manufacturing)

The full lifecycle matters: When your plant-dyed garment eventually reaches end of life, it can be composted. The dye breaks down into organic matter. Synthetically dyed garments release microplastics and chemicals even as they decompose in landfills.

OurCarbon: Carbon-Sequestering Dye

In addition to traditional plant dyes, we use OurCarbon—an innovative organic dye process that actively sequesters carbon while creating color.

How OurCarbon works:

• Uses only salt as a chemical (no heavy metals or toxic substances)
• The dyeing process captures and stores atmospheric carbon
• Creates soft, neutral tones with natural variations
• Each piece has unique saturation patterns

OurCarbon bridges plant dyeing and low-impact synthetic processes, offering another path to color without environmental harm.

How Colors Develop Over Time

Plant-dyed garments aren't static—they develop patina with wear and care, similar to raw denim or vegetable-tanned leather.

What to expect:

Indigo: Fades beautifully with washing and wear, creating high-contrast areas where friction occurs (knees, elbows, seat). This isn't deterioration—it's the fabric developing character.

Walnut: Deepens over time, especially with exposure to light and air. Browns become richer and more complex.

Madder: Generally colorfast but may soften slightly, creating a vintage, worn-in tone.

All plant dyes: May shift subtly with different water pH during washing. This is normal and part of the living nature of the dye.

Caring for plant-dyed garments: Wash in cold water, hang or lay flat to dry, avoid prolonged direct sunlight when not wearing. Following care instructions helps colors remain vibrant.

Why We Commit to Plant Dyeing

Plant dyeing is slower, more variable, and more expensive than synthetic dyeing. So why do we do it?

Because the current system is broken. Textile dyeing pollutes rivers in Bangladesh, China, and India—turning them unnatural colors, making water undrinkable, causing health crises in communities downstream from factories.

Because fashion should be biodegradable. When garments inevitably reach end of life, they shouldn't release toxins. Plant-dyed, natural-fiber clothing can return to the earth safely.

Because variation is honest. The slight differences between pieces aren't flaws—they're evidence of an authentic, handcrafted process that respects natural systems.

Because workers deserve safety. Synthetic dye facilities expose workers to carcinogens and toxic chemicals. Plant dyeing is safe for the people doing the work.

Because the colors are beautiful. Plant dyes create complex, layered tones with depth that synthetic dyes struggle to replicate. The variation isn't a compromise—it's an aesthetic advantage.

What This Means for You

When you wear a plant-dyed Herderin garment:

✓ You're wearing color created from renewable plants, not petroleum ✓ No toxic chemicals were released into waterways ✓ The dye will biodegrade safely at end of life ✓ Workers weren't exposed to carcinogens ✓ Your piece is one-of-a-kind with unique color character ✓ The garment will develop beautiful patina as it ages

The natural variation you see—subtle shifts in saturation, tonal depth, unique color character—is proof that your garment was dyed by hand using materials from the earth.

This is what regenerative fashion looks like when it's done right: beautiful, durable, and designed to return safely to the soil.

About Herderin

Herderin creates regenerative fashion exclusively for tall women. Every garment is designed for bodies 5'9" and taller using Climate Beneficial™ certified materials including regenerative US merino wool, renewable silk, and organic cotton—sewn in San Francisco, California and hand-dyed with plants, OurCarbon organic waste, and Oeko-tex circular dyes, in Washington and California. Pre-orders open through March 15, 2026.