When Mary Barra Was A Senior manufacturing executive a few years ago at General Motors, she spotted another maker's car decked out in a rich metallic black color. It was unlike anything GM was offering, so she suggested the color be added to the company's palette-and was promptly rebuffed by fellow engineers, who fretted about potential quality-control difficulties. But Barra wouldn't take no for an answer, and before long buyers were able to get their Cadillac Escalades and Chevy Malibus in elegant "Carbon Flash."
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