What is black gold and how is it formed ?
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petroleum is black gold it is formed under the layers of Earth
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Black gold is an informal term for oil or petroleum—black because of its appearance when it comes out of the ground, and gold because it made everyone involved in the oil industry rich.
Black-colored gold can be produced by various methods: Patination by applying sulfur- and oxygen-containing compounds. Plasma-assisted chemical vapor deposition process involving amorphous carbon. Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt).
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