Dyeing Process

Part of Natural Dyes & Inks

The complete natural dyeing workflow from fiber preparation to finished color.

Why This Matters

Natural dyeing is not simply dipping fabric in colored water. It is a multi-step chemical process where each stage builds on the previous one. Skipping steps or getting the sequence wrong results in color that washes out, fibers that are damaged, or shades that are nothing like what you intended.

The complete dyeing process — scouring, mordanting, dye bath preparation, dyeing, rinsing, and finishing — has been refined over millennia. Each step serves a specific chemical purpose. Scouring removes oils that block dye uptake. Mordanting creates chemical binding sites. Dye bath preparation extracts and concentrates color molecules. Proper rinsing removes excess surface dye that would otherwise bleed.

Mastering this workflow transforms natural dyeing from unpredictable experimentation into a reliable craft that produces consistent, lasting results.

The Complete Workflow

1. Fiber Selection → 2. Scouring → 3. Mordanting → 4. Dye Bath Prep
     → 5. Dyeing → 6. Rinsing → 7. Drying → 8. Finishing

Each step is detailed below.

Step 1: Fiber Selection

Not all fibers dye equally. The fiber type determines your mordanting approach, temperature limits, and expected color intensity.

Protein Fibers (Animal Origin)

Fiber	Characteristics	Dyeing Notes
Wool	Scales on surface; absorbs dye well	Easiest to dye; felts if boiled or agitated
Silk	Smooth protein fiber; takes dye beautifully	Delicate — keep below 70°C; handle gently
Hair fibers (alpaca, mohair)	Similar to wool but smoother	Dye like wool; colors may be lighter

Protein fibers have natural affinity for most mordant dyes because their amino acid structure provides abundant binding sites for metal ions and dye molecules.

Cellulose Fibers (Plant Origin)

Fiber	Characteristics	Dyeing Notes
Cotton	Short, twisted fibers; absorbent	Harder to dye; needs tannin pre-treatment
Linen (flax)	Long, smooth fibers; strong	Similar to cotton; takes dye unevenly
Hemp	Strong, coarse fiber	Like linen; often better in earth tones
Ramie	Very strong; silk-like sheen	Dyes similarly to cotton

Cellulose fibers lack the protein binding sites that make wool easy to dye. They require a tannin pre-treatment before mordanting to create attachment points for the alum-dye complex.

Step 2: Scouring (Cleaning)

Raw fiber contains natural oils, waxes, dirt, and sizing agents that prevent dye from penetrating evenly. Scouring removes these barriers.

Scouring Wool

1. Fill a vessel with warm water (40-50°C) — hot enough to dissolve lanolin but not hot enough to felt
2. Add cleaning agent — Wood ash water (lye) is the traditional choice; soap works if available. Use approximately 5-10g of soap per liter of water.
3. Submerge the wool and gently squeeze to work cleaning solution through the fiber. Do NOT rub, twist, or agitate — this causes felting.
4. Soak for 30-60 minutes with occasional gentle squeezing
5. Rinse in water of the same temperature — temperature changes cause felting. Rinse until water runs clear.
6. Repeat if necessary — Heavily greasy raw fleece may need 2-3 wash cycles.

Temperature Shock Felts Wool

When rinsing wool, always match the rinse water temperature to the wash water. Plunging warm, wet wool into cold water causes the scales to lock together permanently. This is felting — it’s irreversible.

Scouring Cotton and Linen

Cellulose fibers can tolerate rougher handling:

1. Boil in water with wood ash lye or soap for 1-2 hours
2. Agitate freely — these fibers don’t felt
3. Rinse thoroughly in clean water
4. For cotton, an additional soak in a weak lye bath (wood ash water) for several hours helps remove natural waxes

Testing Scour Completeness

Drop a few drops of water on the dried, scoured fiber. If water beads on the surface, oils remain — re-scour. If water soaks in immediately, the fiber is clean and ready for mordanting.

Step 3: Mordanting

Mordanting creates a chemical bridge between the fiber and the dye molecule. See Alum Mordant for detailed mordanting procedures.

Quick Reference

Fiber	Mordant	Amount (% WOG)	Temperature	Time
Wool	Alum + cream of tartar	12% + 6%	80-85°C simmer	45-60 min
Silk	Alum	8-10%	60-70°C	1-2 hours
Cotton/Linen	Tannin then alum	15% tannin, 15-20% alum	50-60°C	12-24 hours each

Timing

Mordanting can be done:

• Before dyeing (pre-mordanting) — most common and most reliable
• During dyeing (one-bath method) — mordant added to the dye bath. Simpler but less control.
• After dyeing (post-mordanting) — used mainly with iron to shift/darken colors

Pre-mordanting is recommended for beginners because it separates variables — you can evaluate the mordanting independently of the dyeing.

Step 4: Dye Bath Preparation

See Dye Bath for comprehensive preparation instructions.

Summary

1. Chop/crush dye material to expose surface area
2. Soak overnight in water for gentle extraction
3. Simmer 30-60 minutes to extract remaining dye
4. Strain to remove all plant material
5. Adjust volume — ensure enough water for fiber to move freely
6. Check pH and adjust if needed for the desired shade

Step 5: Dyeing

The Standard Method

1. Pre-wet the mordanted fiber — Soak in warm water for 15-30 minutes. This ensures even dye penetration.

2. Check dye bath temperature — It should be warm but not at the target temperature yet.

3. Enter the fiber — Lower pre-wetted fiber gently into the dye bath. Open it up fully — no folds, no bunches.

4. Raise temperature slowly — Increase temperature to the target over 20-30 minutes. Gradual heating produces more even results than plunging fiber into a hot bath.

5. Maintain temperature — Hold at the target temperature for the recommended time:

Category	Temperature	Time
Wool with most dyes	80-85°C	45-60 minutes
Wool with madder	65-70°C	60-90 minutes
Silk	60-70°C	45-60 minutes
Cotton/Linen	85-95°C	60-90 minutes

6. Turn fiber periodically — Every 10-15 minutes, gently lift, turn, and resubmerge the fiber. This prevents one side from receiving more dye than another.

7. Cool-down soak — Turn off the heat and allow the fiber to cool in the dye bath naturally. This can take several hours. For maximum color depth, leave overnight.

8. Remove and evaluate — Lift the fiber from the bath and squeeze gently. Note that wet fiber always looks darker than it will when dry.

Evaluating Color Depth

Fiber dries lighter than it appears when wet — typically 20-40% lighter. To evaluate the true color:

• Squeeze a small section as dry as you can
• Press between two dry cloths
• The resulting shade is close to the final dry color
• If too light, return to the dye bath for more time

Step 6: Rinsing

Rinsing removes excess dye that is sitting on the fiber surface but not chemically bonded. This surface dye would bleed in future washings and stain adjacent fabrics.

Rinsing Procedure

1. First rinse — In warm water (matching the bath temperature for wool). Squeeze gently — don’t wring.
2. Second rinse — In slightly cooler water. The water should show less color than the first rinse.
3. Continue rinsing — In progressively cooler water until the rinse water runs almost clear.
4. Final rinse — In cool, clean water. A splash of vinegar (1 tablespoon per liter) in the final rinse helps set the color and removes any residual alkalinity.

Don't Over-Rinse

Some color in the rinse water is normal and expected — you cannot rinse until the water is perfectly clear without stripping color from the fiber. Stop when the rinse water shows only a faint tint.

Step 7: Drying

1. Squeeze out excess water — Roll the fiber in a clean, absorbent cloth and press firmly. Do not wring or twist wool.
2. Dry in the shade — Direct sunlight can bleach some natural dyes, especially in the first few days before they have fully set. Hang in a well-ventilated, shaded area.
3. Dry flat if needed — Knitted items and delicate fibers should be dried flat to prevent stretching.
4. Allow complete drying — Damp fiber can develop mildew. Ensure thorough drying before storage.

Step 8: Finishing and After-Care

Initial Setting Period

Many natural dyes continue to bond with the fiber for days or weeks after dyeing. During this period:

• Avoid washing for at least one week
• Keep away from strong sunlight
• Handle gently

Washing Dyed Textiles

• Use cool or lukewarm water — not hot
• Use mild, pH-neutral soap — strong alkaline soap (lye soap) can strip some dyes
• Wash similar colors together — even well-mordanted dyes may release tiny amounts of color
• Do not soak for extended periods
• Dry in shade when possible

Long-Term Care

• Store dyed textiles out of direct light — UV is the primary cause of fading
• Avoid prolonged damp storage — promotes mildew that can stain fiber
• Iron on the reverse if pressing is needed — direct heat on the dyed face can cause spotting

Workflow for Different Fiber Types

Wool Workflow Summary

Scour (40-50°C, gentle) → Mordant (alum, 80°C, 1 hour)
→ Dye (80°C, 45-60 min + overnight cool) → Rinse (warm→cool)
→ Dry flat/hanging in shade

Cotton Workflow Summary

Scour (boil with lye, 1-2 hours) → Tannin treatment (12-24 hours)
→ Alum mordant (12-24 hours) → [Repeat tannin-alum if needed]
→ Dye (85-95°C, 60-90 min + overnight) → Rinse
→ Dry in shade

Silk Workflow Summary

Scour (warm water, gentle soap, 30 min) → Mordant (alum, 60-70°C, 1-2 hours)
→ Dye (60-70°C, 45-60 min + slow cool) → Rinse (gentle)
→ Dry flat in shade

Common Mistakes and How to Avoid Them

Mistake	Consequence	Prevention
Skipping the scour	Uneven dye uptake, light spots	Always scour before mordanting
Skipping the mordant	Color washes out	Mordant before dyeing (except substantive dyes)
Boiling wool	Felted, shrunken fiber	Never exceed 85°C; avoid agitation
Adding dry fiber to dye bath	Dark spots, uneven color	Always pre-wet thoroughly
Overcrowded bath	Uneven color, fold marks	Use 30:1 water-to-fiber ratio minimum
Removing fiber too soon	Light, washed-out color	Allow overnight cool-down in bath
Rinsing in cold water (wool)	Felting	Match rinse temperature to bath
Drying in direct sun	Fading on first day	Dry in ventilated shade