Each vat measures approximately 14 feet square and has a stuccoed interior.

The liquor was agitated, allowed to settle, and the remaining sludge strained, molded into cakes, and dried.

The Otranto Plantation Indigo Vats were relocated by the Verona Chemical Company, later Mobay Corporation, from Otranto Plantation to their present site in 1979 to save them from demolition.

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