Cobalt is a hard, silvery-blue chemical element with symbol Co and atomic number 27. It is widely used in alloys, batteries, and pigments. In common usage, the term also refers to a deep blue color resembling the metal’s hue, or to cobalt-containing substances.
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0:59Cadence
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0:59Citrus
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0:58Cobalt
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0:55Comet
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1:02Controversial
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