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Stone artifacts, such as the shot, required only a small amount of mechanical cleaning with an air scribe or dental pick to remove small amounts of adhering concretion or shell. A few small spots of black surface discoloration were removed by spot treating with a mild solution of HCl applied with cotton swabs.
Ballast stones recovered from the ship’s hull were generally covered with marine growth. Those ballast stones chosen for identification were slabbed so that their natural surfaces could be examined without the use of chemical treatments.