Can Primitive Pottery Techniques Be Used for Water Storage?

Choosing the Right Clay

For water storage, it’s essential to select a clay body that is impermeable and resistant to water absorption. Look for clays with a high kaolinite content, which provides good plasticity and strength. A mix of 50% kaolin, 20% feldspar, and 30% quartz can be a good starting point. Test the clay by making a small vessel and immersing it in water for 24 hours – if it doesn’t absorb water, it’s a good candidate for water storage.

Coil Method and Vessel Shape

The coil method is a primitive pottery technique that involves building a vessel from coiled clay. To create a watertight vessel, use a consistent coil size and shape, and ensure that the coils are tightly joined. A spherical or oval shape is ideal for water storage, as it minimizes the surface area and reduces the risk of leakage. The vessel should be at least 1 inch thick to ensure durability.

Firing and Waterproofing

Pit firing is a primitive firing technique that involves firing the vessel in a pit lined with refractory materials. To achieve a waterproof glaze, apply a layer of slip (a mixture of water and clay) to the vessel before firing. The pit should be heated to a minimum of 1800°F (980°C) for 2-3 hours to achieve a hard, impermeable glaze. Alternatively, you can use a mixture of beeswax and pine resin to create a waterproof coating after firing. Apply the coating to the vessel and let it dry completely before use.