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The first stop in doing cast ceramics is the most important and that is the cleaning of greenware.
It is true that greenware is fragile, but it is nothing to be afraid of when cleaning.
When holding a piece of greenware, do it firmly enough to hold it securely, but not hare enough to crack it.
The primary function of cleaning a piece of greenware is to remove the seam line caused by molds in the casting process.