To Techniques

Horsehair (and feather) raku is a raku variant in which strands of horsehair, or feathers, are laid directly onto a red-hot, unglazed pot straight out of the kiln. The intense heat instantly sears and carbonises the hair or feather on contact, leaving fine, smoky black trails and delicate branching marks burned permanently into the clay surface — a technique that captures a genuinely spontaneous, one-touch moment of contact between organic material and fire.

Where Horsehair Raku Comes From

Horsehair raku emerged from the same American Western raku tradition established by Paul Soldner and his contemporaries from the 1960s onward, as potters experimented with introducing different organic materials into the raku process beyond the standard combustible reduction. Unlike copper fuming or standard reduction, which happen inside a sealed container, horsehair raku happens in the open air, in the instant the hair or feather touches the glowing pot — there's no lid, no smoke chamber, just contact and carbon.

The technique has become particularly associated with unglazed, burnished raku surfaces specifically because bare clay shows the fine, smoky trails far more clearly than a glazed one would — it's one of the few raku variants that deliberately avoids glaze on the marked areas entirely.

How the Process Works

1. Bisque fire first — the piece must already be bisque-fired.

2. Burnish the surface — horsehair markings show most clearly on a smooth, burnished or terra sigillata surface rather than rough bisque.

3. Fire it hot — the piece is fired in a raku kiln to around 950–1000°C, until glowing.

4. Pull it red-hot — using tongs, the piece comes straight out of the kiln while still glowing.

5. Lay on the hair or feather — strands of horsehair (or feathers) are placed directly against the hot surface; they sear and carbonise on contact almost instantly, leaving a black trail exactly where they touched.

6. Let it finish cooling and seal — once all markings are placed, the piece is left to cool in open air (or given a light reduction for background tone); some potters apply a light wax afterward to protect the carbon markings.

What Creates the Markings

• Hair thickness and type — coarser tail hair leaves thicker, bolder lines; finer hair produces delicate, hair-thin trails

• Feather structure — feathers often leave branching, structured patterns following their natural barb pattern rather than a single line

• Placement and angle — how and where the material is laid against the hot surface determines the final composition entirely

• Surface temperature at contact — a piece that's cooled slightly before the hair is applied gives softer, greyer marks; a piece still glowing hot gives the sharpest, blackest lines

Is Horsehair-Fired Pottery Food Safe?

No. Like all raku work, horsehair and feather raku pieces are unglazed, porous, and not intended for food or liquid contact. These are decorative pieces — vases, sculptural forms, wall pieces — valued for their markings, not their function.

What You Need to Try It

• Bisque-fired stoneware, burnished or with a terra sigillata surface for the clearest markings

• Horsehair or feathers, cleaned and ready to apply

• A raku kiln capable of firing to raku-range temperatures

• Long tongs and heat-resistant gloves

• A steady, quick hand — the marking window lasts only seconds per piece

Because the marking happens in a split second of direct contact, there's no reworking a placement once it's made — the technique rewards a steady hand and quick decision-making in the moment.

Try It Yourself

I run horsehair and feather raku workshops at my studio in Koringberg, in the Swartland, about an hour from Cape Town — often paired with standard raku firing in the same workshop day. No experience is necessary; I provide the kiln, materials, and guidance on placement and timing.

See Horsehair Raku Workshops

Frequently Asked Questions

Can beginners do horsehair raku?

Yes. The marking technique itself is simple to learn, though it benefits from a demonstration first since the contact window is brief.

How is horsehair raku different from standard raku?

Standard raku relies on glaze crackle and smoke reduction inside a sealed container. Horsehair raku works on bare, unglazed clay in the open air, with the marks coming directly from hair or feather searing on contact rather than from a glaze or enclosed reduction.

Does the type of hair matter?

Yes — coarser hair produces bolder, thicker lines, while finer hair gives delicate hair-thin trails. Feathers tend to leave more structured, branching patterns following their natural shape.

Is horsehair raku dangerous?

It involves handling a very hot, glowing pot at close range while placing material by hand, so it carries the same fire safety considerations as standard raku — proper gloves, tongs, and supervision matter.

How long does a horsehair raku firing take?

Similar to standard raku — each piece takes under an hour from kiln to finished result, with the actual marking moment lasting only seconds.