Quick Answer
CHOOSING THE RIGHT CLAY FOR SPECIFIC POTTERY PROJECTS involves selecting a clay body that meets the desired physical and aesthetic properties, as well as the firing method, such as primitive pit firing or a kiln.
Clay Sourcing and Selection
When sourcing clay, consider the local geology and environment to identify suitable deposits. Look for areas with abundant clay deposits, such as riverbanks, lakebeds, or hills. Test the clay’s plasticity, dry strength, and firing behavior by mixing it with water and observing its consistency and shrinkage.
Firing and Clay Compatibility
Different firing techniques require specific clay bodies. For primitive pit firing, a coarse-grained clay with high silica content can produce a durable and attractive finish. To achieve a waterproof surface, incorporate a small amount of kaolin or feldspar into the clay body. When using the coil method, a clay with a moderate plasticity and a small amount of grog can facilitate even coil construction and minimize cracking.
Pit Firing and Waterproofing Techniques
To achieve a waterproof surface in pit-fired ceramics, apply a layer of natural wax, such as beeswax or plant resin, to the dry vessel before firing. This layer will help create a hydrophobic surface. Alternatively, mix a small amount of bentonite into the clay body to enhance its water resistance. When firing in a pit, maintain a consistent temperature, typically between 900°C to 1100°C, to achieve the desired results.
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