Engine oil turns black from a combination of combustion byproducts, heat oxidation, and detergent additives suspending carbon particles in the fluid. Black oil is not automatically a sign of a problem ...

Overnight, LME copper opened at $13,146/mt and hit an early high of $13,153/mt. Thereafter, the center of copper prices gradually moved lower, dipping to $12,975/mt near the close, and finally settled ...