Req 4 — Pottery Vocabulary

Pottery has a lot of special vocabulary because clay changes so much from start to finish. Some words describe tools. Some describe materials. Some describe stages in a piece’s life. If you can explain these terms clearly, you will sound like someone who understands the process instead of someone guessing from the outside.

Tools and working methods

Bat — A removable round or flat surface attached to the wheel head. Potters use a bat so they can lift a freshly thrown piece without touching and warping it.

Wedging — Kneading clay to even out moisture, remove air pockets, and align the clay so it behaves better while building or throwing.

Throwing — Shaping clay on a spinning potter’s wheel with your hands and tools.

Grog — Fired clay that has been crushed into gritty particles and mixed into clay bodies to add strength and reduce shrinkage.

Slip — Clay mixed with water until it becomes creamy or liquid. Slip can be used for joining, decorating, or coating surfaces.

Score — Scratch or roughen two clay surfaces before adding slip and joining them. Scoring helps the pieces lock together.

Stages of drying and firing

Leather hard — Clay that has dried enough to hold its shape but is still damp enough to carve, trim, or attach pieces.

Bone dry — Clay that feels room-temperature dry and has no visible moisture left. At this stage it is very fragile.

Greenware — Any unfired clay object after it has been formed and dried.

Bisque — Pottery that has gone through its first firing. Bisque ware is harder than greenware but still porous enough to absorb glaze.

Pyrometric cone — A small cone made of special ceramic material that bends at a known heat-and-time combination inside the kiln. Potters use cones to measure how much firing work the kiln has done.

Clay families and surfaces

Terra-cotta — A reddish-brown fired clay, often low-fired, commonly used for flowerpots, tiles, and traditional earthenware.

Earthenware — Clay fired at a lower temperature. It is often more porous and can include terra-cotta bodies.

Stoneware — Clay fired hotter than earthenware, making it denser and stronger. Many mugs, bowls, and dinnerware pieces are stoneware.

Porcelain — A very fine, smooth clay body that fires hard and often white. It can be beautiful and translucent, but it is less forgiving to work with.

Glaze — A glass-like coating that melts onto pottery during firing. Glaze can add color, texture, shine, food-safe surfaces, or waterproofing.

Official Resources

Req 5 puts this vocabulary to work. You will hand-build, sculpt, throw, and think about firing, so words like leather hard, score, bisque, and glaze will stop being definitions and start becoming real steps.