Your first month of natural dyeing

You don't need a farm, a chemistry degree, or a whole studio. Here's what actually happens in your first four weeks — from the first mordanted skein to your first proper indigo vat.

By The JustBeginning Editors · Published May 24, 2026

Natural dyeing has a reputation for being complicated — chemistry, mordants, pH, fiber preparation. That reputation is mostly wrong. The basic process is: scour your fiber, mordant it with alum, simmer it in a dye bath. That’s it. You can do your first batch in an afternoon.

The complexity is real, but it comes later: when you want specific colors, when you’re working with cotton or linen, when you build a reduction vat for indigo. In your first month, you don’t need any of that. You need a dedicated pot, a bag of potassium alum, and some undyed wool. The rest is patience and heat.

Week 1: Your first mordant bath

Before your fiber touches any dye, it needs to be mordanted — treated with a metallic salt that opens the fiber and allows dye molecules to bond permanently. Without this step, most plant colors wash out within weeks.

Potassium alum (aluminum sulfate) is where everyone starts. It’s safe to handle without respirators or heavy PPE, available online for $10-15 a pound, and produces bright, warm results on wool. One pound will cover a year of beginner-level dyeing.

The mordanting process:

1. Weigh your dry fiber. Write it down — everything else is a percentage of this number.
2. Calculate 10-15% of that weight in alum (10-15g per 100g fiber). Measure it on a kitchen scale.
3. Dissolve the alum in a small amount of hot water in your dedicated dye pot.
4. Wet your fiber by soaking it in warm water for 20-30 minutes first — dry fiber dropped in hot water will shock-felt.
5. Add the wet fiber to the mordant bath, fill with warm water to cover.
6. Bring slowly to 180-190°F. Hold there for 45 minutes. Check your thermometer.
7. Remove from heat and let cool slowly in the bath — a slow cool helps the mordant exhaust completely.

Your fiber won’t look different after mordanting. That’s correct. The change is chemical, not visible. The difference shows up when you dye.

Week 2: Your first dye bath — start with madder

Madder root (Rubia tinctorum) is the oldest natural red dye in the world and the best introduction to exhaust dyeing. The warm reds, terracottas, and burnt oranges it produces are genuinely beautiful, and it’s one of the most lightfast natural dyes available — meaning results that last decades with proper care.

If you’re using extract powder (more consistent than ground root for beginners): use 10-20% weight of fiber for a medium shade, dissolved in hot water before adding your fiber. If you’re using madder root powder, use 50-100% weight of fiber and expect the process to take longer.

The critical rule with madder: don’t boil. Boiling shifts the color from warm red toward a flat brown. Keep your dye bath at 160-180°F. A thermometer is not optional here.

The dye process mirrors mordanting:

1. Dissolve your dye material in a small amount of hot water and add to your dye pot.
2. Add your pre-mordanted (wet, not dry) fiber.
3. Bring slowly to 160-175°F and hold for 45-60 minutes.
4. Cool slowly in the bath before removing — colors deepen during the cool.
5. Rinse gently in water of similar temperature, then cooler water progressively.

Exhaust your bath. After removing the main fiber, the bath has color remaining. Add an unmordanted skein — it’ll pick up a paler, softer version of the same color for free. This secondary exhaust is often one of the most beautiful results you’ll get all month.

Week 3: Explore what you have

By week three, you’ve mordanted and dyed at least one batch. Now push the palette without buying anything new.

pH shifting. Your madder bath sits at whatever pH your tap water has. Add a splash of white vinegar to lower the pH (more acidic = cooler, pinker reds on madder). Add a pinch of baking soda to raise it (more alkaline = browner, more orange). Document what happens. This is chemistry you can do with grocery store ingredients.

Iron modifier. If you ordered ferrous sulfate, try it now. After dyeing, dissolve 1-2% weight of fiber in hot water and briefly (5-10 minutes) simmer your dyed fiber in this iron after-bath. Watch the color sadden and shift toward olive or khaki. Rinse immediately. A little iron goes a long way — the effect is permanent.

Kitchen dyes. Onion skins (the papery outer layers — yellow and brown, not the white inner ones) give brilliant golds and yellows on alum-mordanted wool. Simmer them in water for an hour, strain, and add your fiber. Avocado pits and skins (save and dry them over a few weeks) produce a soft pink-mauve that requires no mordant. Black tea gives a warm tan on unmordanted fiber. None of this costs anything.

Week 4: Try indigo — and understand why it’s different

Indigo is the one dye that stands apart from everything else in natural dyeing. It’s the blue of denim, ancient Egyptian linens, Japanese katazome fabric. No other plant source produces it. And it works through a completely different process than what you’ve been doing.

Madder and weld are exhaust dyes — they dissolve in water and bond to fiber when mordanted. Indigo is vat-soluble — it has to be chemically reduced (have oxygen removed) to dissolve at all, then re-oxidizes to blue on contact with air as you pull the fiber out of the vat. This is why fresh-from-the-vat fiber looks greenish and then turns blue in front of your eyes as it oxidizes. It’s one of the most visually dramatic moments in the craft.

What this means practically:

• No mordant. Alum-mordanted fiber will actually produce muddier results with indigo. Dye un-mordanted fiber.
• Multiple short dips, not one long soak. 2-5 minutes per dip, remove, oxidize fully (15-20 minutes in air), then dip again. More dips = deeper blue.
• Maintain pH 9-11 in your vat. Test with pH strips. Below 9 and the vat won’t work. Above 12 and you damage fiber.

If you bought the Jacquard Natural Indigo Kit, follow its instructions — the kit has pre-reduced indigo and handles the chemistry for you. Your first indigo session will feel like magic.

The mistakes everyone makes in month one

These are predictable. You will make at least one of them:

• Shocking the fiber with temperature changes. Wool felts when there’s a sudden temperature swing combined with agitation. Move slowly: warm to warm, cool to cool. The golden rule is “no more than 10°F change per minute.”
• Skipping the notes. You’ll get a color you love and have no idea how you got it. Weigh everything, write down percentages, note the temperature and time. Without records, every result is a one-off accident.
• Opening the dye bath too early. Patience is the skill. The last 15 minutes of a simmer and the slow cool afterward are when the deepest color sets. Pulling fiber early consistently produces paler, less-even results.
• Using too much mordant. Alum at 10-15% weight of fiber produces bright, clean results. At 25-30%, you’ll get sticky, unpleasant-to-touch wool that breaks down faster in wear. Measure.

At the end of month one, you’ll have a small collection of naturally dyed skeins and a notebook with the beginnings of your own dye recipe archive. That notebook is worth more than any product in the gear guide.

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Ready to put together the right equipment? See our natural dyeing gear guide for the four things worth buying first and the six things you can skip until month two.