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You don't make it, you find it. Or you buy it.
Go where they are digging the foundations of buildings. You might find clean clay. Once we gotten clay from the base of the John Hancock Building in Chicago. Deep!
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No idea about pottery clay but I can suggest you to Algram(www.algram.co.uk) for purchasing all types of pottery which are used in decorating homes.
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Copyright © 2018 HubPages Inc. and respective owners.