Most potters never mix clay from raw materials. They buy it ready-made, then prepare it by wedging, reclaiming scraps and making slip. This article covers those everyday tasks, plus how to adjust a clay body and work with air-dry clay.
What “mixing clay” usually means
Beginners searching for this often mean one of four things:
- Getting store-bought clay ready to use (wedging).
- Recycling dry or leftover clay (reclaiming).
- Making slip, a liquid clay used as glue or decoration.
- Combining clays or adding materials like grog.
Mixing a clay body from raw ingredients is an advanced practice that depends on a specific recipe, a kiln and testing, so this guide does not give formulas. If you want to try it, start from a published recipe and test small batches. If you are still choosing clay, see pottery clay types and how to choose one.
Wedging
Wedging kneads clay to even out moisture and push out trapped air. Air pockets can cause problems in the kiln, and uneven clay is harder to throw or build with.
- Set up a solid work surface, such as a canvas-covered board or plaster slab.
- Cut the clay with a wire to check for air holes.
- Use a rocking push, folding the clay over itself in a steady rhythm. Common methods include ram’s head and spiral wedging.
- Cut again to check. Repeat until the cut face looks smooth and even.
Reclaiming scrap clay
Trimmings and failed pieces can usually be reused if they have not been fired. Fired clay cannot be turned back into usable clay.
- Let scraps dry completely.
- Break them up and soak in water until they slump into a soft mass.
- Pour off excess water and let the clay stiffen on a plaster slab or absorbent surface.
- Wedge before use.
Keep different clay types separate, since mixing bodies with different firing ranges can cause cracking or other problems.
Making slip
Slip is clay thinned with water to roughly the consistency of cream. It is used with scoring to join pieces, as covered in pottery techniques every beginner should learn. Use the same clay as your piece, and add water gradually while stirring. Many potters also make decorative colored slips with stains, following the supplier’s instructions.
Adjusting a clay body
Potters sometimes add grog or sand to increase strength and reduce shrinkage for large pieces, or blend a little of a smoother clay into a gritty one. Small changes can change how clay shrinks, fires and glazes, so test a few tiles before using a modified clay on a full project. Check with your studio or the clay supplier first, especially for pieces meant to hold food or drink.
Dust safety
Dry clay dust contains fine particles, and breathing silica dust over time can be harmful. Common precautions include:
- Wiping surfaces with a damp sponge instead of sweeping.
- Avoiding sanding or handling dry clay without proper ventilation.
- Wearing a suitable respirator when mixing dry materials.
- Keeping clay and tools away from food areas.
A well-planned craft room with wipe-clean surfaces and good ventilation helps. For specific health guidance, consult your clay supplier’s safety data sheet or a qualified professional.
Working with air-dry clay
Air-dry clay generally comes ready to use and needs only light kneading. Keep it covered with plastic to stop it drying out, and smooth cracks with a little water. Follow the label for drying time and sealing, and do not assume it is waterproof or food-safe unless the manufacturer states so. It does not need a kiln, so it is not fired like pottery clay. For project ideas, see clay crafts for adults.
Storing clay
Wrap clay in plastic and seal it in a bag or bucket. If it starts to dry, wrap it with a damp cloth. If it becomes too wet, spread it on an absorbent surface to firm up.
FAQ
What is the difference between pottery and ceramics? Ceramics is the broader term for objects made from clay and hardened by heat. Pottery usually refers to vessels and similar wares. See pottery vs ceramics for the key terms.
What can I make from clay? Common beginner projects include pinch pots, mugs, bowls, plates, planters, tiles, ornaments and small sculptures.
Can I do pottery with air-dry clay? You can make similar shapes, but it is not fired, so results are generally best for decorative items.