Paper Clay — Cellulose-Infused Ceramic Body

Ana has been experimenting with cellulose additions for years, first using newspaper pulp, now working toward natural cellulose powder — a white fibrous material sold in small bags that looks a little like talc. At the June workshop, she brought tissue paper as a practical stand-in, since this was a test run with an unfamiliar Seoul supplier's tapioca rather than her usual recipe.

What cellulose does inside clay

The fibres act as a reinforcing mesh within the wet clay body:

• Reduces cracking during drying — as clay dries it contracts. Short cellulose fibres bridge the micro-cracks that form, preventing them from opening into structural failures.
• Enables taller and more open structures — standard clay has a practical height limit beyond which the weight of the wet clay above causes the structure to slump or collapse. Cellulose reinforcement extends that limit considerably.
• Translucency after firing — the fibres combust in the kiln, leaving thin channels through which light can pass. In thin-walled objects you can see the fibre pattern as a subtle texture in transmitted light.
• Can be used unfired — mixed with papier-mâché binder instead of ceramic clay, cellulose structures can be polished and kept as permanent objects without any kiln. They will eventually biodegrade and can be composted.

Preparation

Cellulose must be softened before incorporation:

1. Tear or cut paper into small pieces (1–2 cm). Soak in water until completely limp and soft — an hour is usually enough for thin paper; newspaper takes longer.
2. Blend briefly to a loose pulp. Do not over-blend — you want short fibres, not a homogeneous slurry.
3. Squeeze or strain out most of the water until the pulp is damp but not soupy.
4. Work into the clay by cutting and folding — the same repeated-cut wedging motion used for any additive. At 3% dry weight, the clay's handling properties change noticeably but the body is still clearly ceramic.

Ana calibrates by feel rather than strict measurement. The goal is a clay that handles slightly differently than usual — marginally more open-textured, a little less prone to surface cracking as it stiffens.

Types of cellulose

Different sources give different results:

• Natural cellulose powder — very fine, white, pure. Gives the cleanest result and most predictable handling. Sold in craft and ceramics suppliers.
• Newspaper — the fibres are longer and coarser. More texture in the fired result. Ana's first experiments used this.
• Tissue paper / toilet paper — between the two. Convenient for improvisation, as at the workshop.

Each source behaves slightly differently with the clay body. If you are developing your own paper clay for studio practice, Ana's advice is to test one source thoroughly before switching — the material is your signature, and a consistent result becomes something you can depend on and push further.

Firing

Paper clay fires exactly like the base clay it was made from. The cellulose combusts in the bisque stage and is entirely gone before the high fire. There is slightly more smoke in the early stages than unmodified clay, roughly comparable to cooking fumes — not acutely problematic but worth noting for ventilation. Standard two-fire sequence: bisque first, glaze if desired, then final high fire.

Jay's Studio Note

Ana said the tissue paper was improvised — couldn't source her usual cellulose powder in Seoul. What stuck with me: she wants it to work with any recycled paper, not just the premium version.

References

• Ana Bridgewater — Bio-Ceramic Workshop at Material Memory Studio (June 2026)