Special light boxes, or flat lamps that simulate natural white light with a blue tint, are also effective, noted Foster, who has been consulting with Delta on the feasibility of introducing such lights into airport lounges.
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Wearing white surgical gloves, he dug up a fistful of black mud and held it so that the sunlight caught the telltale blue-orange tint of petroleum.
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HIDs are the bright lights with a blue-ish white tint seen often on expensive European cars.
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