Why Stoneware Suits Hand-Building

Stoneware is the friendliest clay for anyone working without a wheel. It is a strong, high-fired body that matures somewhere between 1200°C and 1300°C, and once fired it is dense, durable and happy to be used every day. Thrown mugs are usually walled at around 5mm, but hand-built ones often end up nearer 7–8mm, and stoneware simply shrugs that off. The same thickness in earthenware would feel clunky and can be vulnerable to thermal shock when you pour in boiling water.

For a first mug, choose a grogged stoneware — one with fine grog (pre-fired clay grit) blended through it. The grog opens up the body slightly, which reduces cracking during drying and gives the walls a little internal scaffolding. It also makes the clay more forgiving if your pressure is uneven, which, on your first attempt, it will be.

Setting Up Before You Touch the Clay

Sort your space out first, because once your hands are muddy you will not want to go hunting for tools.

• Work on a wooden board or plaster bat, covered with a sheet of calico or canvas to stop the clay sticking.
• Have a wooden rib, a metal kidney, a needle tool, a sponge, a fork and a small pot of slip ready.
• Make slip by mixing scraps of the same clay with water to a double-cream consistency. It is your glue and nothing else works as well.
• Wedge 1–1.5kg of clay properly — spiral wedging or ram's head — to push out trapped air. Air pockets become steam in the kiln and can blow a hole straight through your mug.
• A rolling pin plus two dowels at 8mm diameter makes a reliable slab thickness gauge.

Keep everything at a similar moisture level. Clay that is drying at the edges while staying wet in the middle will crack as it settles.

Pinch, Coil or Slab: Pick Your Route

Pinching is the quickest route to a finished mug. Roll a ball about 9cm across, press your thumb into the centre, stopping roughly 8mm from the bottom, then pinch outwards in small increments, rotating the ball as you go. Your thumb supports the inside, your fingers shape the outside. Aim for walls of 6–8mm.

Coiling gives the most control and the best cylindrical mug. Roll coils 1–1.5cm thick with a flat palm on a board, building up in bands of 2–3cm. Score and slip every join, blend it with your fingers and a rib, then wrap the piece in plastic between sessions. A coil pot can sit happily for days if you keep it covered.

Slabs produce crisp, straight-sided mugs. Roll clay to 8mm between your dowel guides, cut a rectangle, then wrap it around a cylinder former — a cardboard tube or a straight-sided glass, lined with baking paper. Join the seam with scored edges and slip, then add a slab base. A popular hybrid is a pinched base with coiled walls, which is stable and quick.

Shaping the Body and Getting the Walls Even

Think about size before you think about shape. A comfortable 300ml mug is roughly 9cm tall and 8cm across. Taller and narrower stays hotter for longer; wider and shallower cools faster and is easier to clean.

Run a wooden rib around the outside of the wall regularly. This compresses the clay, aligns the particles and smooths the surface all at once. Press the rim gently between finger and thumb to firm it, then sponge it level so the lip is even all the way round. Stand the mug on a flat board and tap the base down until it sits without rocking.

Check your thickness as you go. Pinch the wall or push a needle through a scrap area — if it is under 5mm the mug will feel fragile and burn your hands; over 12mm and it will be heavy and slow to dry. The base should be slightly thicker than the walls, around 10mm.

A Handle That Fits a Real Hand

Wait until the mug is leather hard: firm enough to hold its shape, soft enough that a fingernail leaves a mark. Attaching a handle to soft clay means it will slump; attaching to bone-dry clay means it will simply fall off.

• Pull a handle from a lump of clay, or roll a tapered coil about 1.5–2cm thick.
• Leave an opening of 3–4cm wide and 6–8cm long — enough for two or three fingers.
• Attach the top join 1–2cm below the rim so knuckles clear the lip, and the bottom join about 2cm above the base.
• Score both the handle ends and the mug, paint on slip, press firmly, then blend the top join into a subtle thumb rest.

Lay the mug on its side on a folded cloth while you work, and check the handle lines up with the base — a mug that leans is a mug that spills.

Drying, Finishing and Firing

Drying is where most hand-built mugs are lost. Put the mug inside a plastic bag and seal it. Open the bag for an hour the next day, then a little longer each day after that, for one to two weeks. Handles dry fastest and will crack away from the body, so wrap a strip of plastic over the handle for the first few days. Keep the mug away from radiators and draughts.

When the clay is leather hard, tidy the surface with a damp sponge or a rib, and smooth the base. Once it is firm enough to handle without denting, turn it upside down so the base dries at the same rate as the walls.

When it is properly bone dry, it goes for a bisque firing at around 1000°C. After that, glaze it and return it for a stoneware firing at 1220–1280°C. Your local kiln service or studio will give you their own schedule, so follow that. Until it has been fired, greenware clay is brittle and should never be used for drinking — but once glazed and fired, a well-made stoneware mug is dishwasher and microwave friendly.

Your first mug will be a bit lopsided. Keep it anyway. The second one will be better, and by the fourth you will have a handle that fits your hand exactly.