The most common question about handmade ceramics is why they cost what they do, and the most common assumption is that the answer is time spent at the wheel. It is not. Throwing a mug takes a competent potter a few minutes. Nearly all of the remaining time is drying, waiting, firing and waiting again, and any one of those stages can end the piece.
A typical stoneware mug in a small studio takes roughly twelve days from clay block to finished object, of which only about forty minutes is hands-on shaping. The rest breaks down into drying to leather-hard, trimming and attaching the handle, several days of slow controlled drying to bone dry, a bisque firing plus its cooling cycle, glazing, and a second higher glaze firing plus its cooling cycle. Kilns cannot be rushed in either direction, because heating too fast turns trapped water to steam inside the wall and cooling too fast cracks the body as quartz changes volume. Individual studios vary and large sculptural forms take considerably longer, but the shape of the process holds.
Key takeaways
- Wedging, the kneading step before throwing, drives out air pockets that would expand and break the piece in the kiln, and aligns the clay platelets so the body behaves consistently.
- Clay shrinks by roughly five to eight percent during drying depending on the body, which is why a maker cannot promise exact finished dimensions.
- Bisque firing takes clay to around 1000 degrees Celsius, converting it chemically while leaving it porous enough to absorb glaze.
- Quartz in a clay body changes volume as it passes through a crystal inversion near 573 degrees Celsius on the way down, so cooling has to be as slow as heating.
- Glaze firing for stoneware commonly runs between 1220 and 1280 degrees Celsius, which is where the body vitrifies and the glaze melts into glass and fuses to it.
The twelve days at a glance
| Stage | Roughly | What happens | What ends the piece here |
|---|---|---|---|
| Wedging and throwing | Day 1 | Air driven out, clay centred, walls pulled and shaped | A trapped air pocket, or an off-centre start |
| Trimming and handles | Days 2 to 3 | Foot ring trimmed at leather-hard, handle pulled and attached, carving cut | Rim drying ahead of the base |
| Drying to bone dry | Days 4 to 7 | Remaining water leaves slowly under progressively opened plastic | A rushed dry, or a knock while fragile |
| Bisque firing | Days 8 to 9 | Around 1000 degrees Celsius, plus an equally long cool | Steam inside the wall, or a fast cool through quartz inversion |
| Glazing | Day 10 | Wax resist on the foot, then dipping, pouring, brushing or spraying | Finger oil repelling glaze, or a masking error |
| Glaze firing | Days 11 to 12 | Commonly 1220 to 1280 degrees for stoneware, then a controlled cool | Glaze running onto the shelf, or a body crack opening |
Day 1: wedging and throwing
Clay arrives in plastic-wrapped blocks and cannot go straight onto the wheel. It gets wedged, a kneading motion that drives out air pockets that would expand in the kiln and aligns the platelet structure so the clay behaves consistently. Ten minutes per lump, done properly.
Then centring, the actual skill barrier: the clay has to run true on the wheel head before anything else can happen, and an off-centre start guarantees uneven wall thickness later. Then opening, pulling the walls up in three or four passes, shaping, and cutting the piece off with a wire. For a mug, four to six minutes of contact time.
Days 2 to 3: leather-hard, trimming and handles
The piece dries under loose plastic until it reaches leather-hard, firm enough to hold its shape upside down but soft enough to cut. Timing depends entirely on studio humidity, which is why potters obsess about the weather. Too fast and the rim dries ahead of the base, setting up a stress that cracks later.
At leather-hard, the piece goes back on the wheel inverted and the foot ring is trimmed, removing excess clay left at the bottom during throwing. This is where final weight and balance are decided. Handles are pulled separately, allowed to stiffen, then scored, slipped and attached. Carved decoration also happens here, since leather-hard clay cuts cleanly, and every carved line becomes a future glaze pool. Pieces with a lot of carving, like the hand-carved work in our ceramic mug collection, spend most of their labour hours in this window rather than at the wheel.
Days 4 to 7: drying, slowly
The piece now has to lose almost all remaining water before firing, and evenly. Handles and rims dry faster than thick bases, so pieces are tented with plastic opened progressively over several days.
Shrinkage at this stage runs somewhere between five and eight percent depending on the clay. A rushed dry is the most common cause of the crack that appears at the handle joint two firings later.
By day seven the piece is bone dry: pale, cold to the touch, and extremely fragile. This is the most vulnerable state in the entire process. A bone-dry mug knocked off a shelf is dust.
Days 8 to 9: bisque firing
The first firing, typically to around 1000 degrees Celsius. The purpose is to convert the clay chemically so it can never return to plastic form, while leaving it porous enough to absorb glaze.
The schedule matters more than the peak: a slow climb to drive off physical water without turning it to steam inside the wall, then a hold where chemically bound water leaves the clay structure, then the climb to peak.
Why cooling takes as long as heating
Nobody opens a kiln early. Quartz in the clay body goes through a crystal inversion around 573 degrees on the way down, changing volume as it does, and a piece pulled through that point too fast cracks with a distinctive sharp ping. Firing plus cooling occupies a full day or more with no shortcuts available.
Day 10: glazing
Bisque ware is dusted or sponged clean, since any oil from fingers repels glaze and shows as a bare patch. Wax resist is painted on the foot ring so glaze does not stick there.
Then dipping, pouring, brushing or spraying, depending on the effect. Application takes seconds and the decisions take much longer, because the colour in the bucket bears almost no relationship to the colour after firing. Most glazes go on as a chalky pastel grey or pink. Hand-painted decoration is applied at this stage too, and the painter is working essentially blind, judging by memory of how each oxide fires.
Pieces that complicate glazing
Anything with a moving or interlocking part, like the Jingdezhen spinning pig ornament, has to be masked wherever two surfaces might touch during firing, because melted glaze is adhesive and will weld the mechanism solid. Multi-part sets such as these ceramic frog ornaments have to be glazed to match across separate objects that will not occupy identical positions in the kiln.
Days 11 to 12: glaze firing and unloading
The second firing goes considerably higher, commonly 1220 to 1280 degrees for stoneware. This is where the clay body vitrifies, becoming dense and non-porous, and where the glaze melts into glass and fuses to it.
Then another full heating and cooling cycle, usually with a controlled slow cool if the glaze needs crystal development. The kiln is opened when it reads below 100 degrees, which for most studios means the following morning.
What comes out
Not everything. Loss rates in small studios run from a few percent for simple forms up to a substantial fraction for complex sculptural work. Losses at the end are the expensive ones, because that piece has absorbed the full timeline plus two firings of fuel.
Twelve days, two firings, roughly forty minutes of hands-on shaping, and a dozen points where it could have failed. That is what sits behind one cup. It is also why a piece from our minimalist ceramic accent range, where a plain surface hides nothing, represents a harder set of days than a decorated one.
Frequently asked questions
Why do handmade ceramics take so long to make?
Because most of the timeline is drying and firing rather than shaping. Clay has to lose its water slowly and evenly to avoid cracking, and both firings need controlled heating and equally controlled cooling. The wheel work is a small fraction of the total.
What is the difference between bisque firing and glaze firing?
Bisque firing, around 1000 degrees Celsius, converts raw clay into a permanent porous state that can absorb glaze. Glaze firing goes much higher, commonly 1220 to 1280 degrees for stoneware, vitrifying the body and melting the glaze into glass.
Why can't a potter guarantee exact dimensions?
Clay shrinks by roughly five to eight percent as it dries and shrinks again during firing, and the exact figure depends on the clay body and the firing. Two pieces thrown to the same size can finish slightly different.
