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Barium Sulphate - Overview
Barite (BaSO4) is a mineral consisting of barium sulphate. It is generally white or colorless, and is the main source of barium. Baryte is the British spelling, and the mineral is also called heavy spar. Barium sulphate is extremely insoluble in acid and water and is therefore chemically inert. It is the principal source of the element barium.
Barium sulphate is used as a white pigment for paper pigment due to its white appearance. In ink-jet printing, barium sulfate is employed to improve the brightness and whiteness of the paper. For photographic paper, a thin layered coating of barium sulfate would help to increase the reflectiveness of the image.