Dark Nilas is a term used to describe ice type with a deep blue hue in the Arctic region. Some synonyms for dark nilas include blue ice, deep ice, midnight ice, black ice, and dark ice. These names all refer to different degrees of darkness that can be observed in Arctic ice formations. Blue ice, for example, refers to the bluish tint that can be seen on icebergs and sea ice when they are hit by sunlight. Midnight ice describes the deep black color that ice takes on during the darkest hours of the Arctic winter. Each of these terms is used interchangeably to describe different types of ice formations in the Arctic region.