You can make clay from clay soil through a process of separating the clay particles from other components of the soil using water and settling. Here's how:
Step-by-Step Guide to Making Clay
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Discard the Topsoil: Remove the topsoil layer, as it contains organic matter that isn't suitable for making clay. The subsoil, which is richer in clay, is what you need.
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Combine Soil and Water: In a large container, mix a generous amount of the clay soil with water. The ratio isn't exact, but aim for a slurry-like consistency. Ensure the soil is thoroughly saturated.
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Separate the Clay Layer (Elutriation):
- Stir the mixture vigorously to suspend all the soil particles in the water.
- Allow the mixture to settle. Heavier particles like sand and silt will settle first. The clay particles, being the smallest, will remain suspended for longer.
- Carefully pour off the water, which contains the suspended clay particles, into another container. Be careful not to pour off the settled sediment.
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Repeat the Process: Repeat steps 2 and 3 multiple times to extract as much clay as possible from the original soil.
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Pour Off Excess Water: Allow the clay suspension (the water you poured off in previous steps) to settle for several hours or overnight. The clay will slowly settle to the bottom. Carefully pour off the clear water on top, leaving the clay at the bottom.
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Wrap the Clay in Cloth (Dewatering): Line a container with a piece of porous cloth (like muslin or cheesecloth). Pour the clay slip (the remaining clay and water mixture) into the cloth-lined container.
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Hang the Clay (Further Dewatering): Gather the edges of the cloth to form a bag and tie it securely. Hang the bag over a bucket or container to allow excess water to drip out. The duration will depend on the consistency you want, which can range from a workable plastic clay to a drier, leather-hard clay. The longer it hangs, the drier the clay.
Important Considerations
- Soil Source: The success of this method depends on the type of soil you're starting with. Soil with a high clay content is essential. Experiment with different sources to find the best results.
- Patience: This process can take several days to complete, as it relies on settling and dewatering.
- Refinement: You may need to wedge (knead) the clay to remove air bubbles and ensure a consistent texture before using it for modeling or pottery.
- Testing: Once the clay has reached a usable consistency, test its workability and firing properties if you plan to fire it.
