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56 Barium -Ba- Ba. sulfate is used as an insoluble heavy additive to oil well drilling fluid, and in purer form, as X-ray radiocontrast agents for imaging the human gastrointestinal tract. Soluble barium compounds are poisonous due to release of the soluble barium ion, and therefore have been used as rodenticides. A light, soft, silvery alkaline metal which reacts easily with air and water and is often stored under oil.