What color combination is commonly used on isolated danger marks?

Isolated danger marks are specifically designed to indicate an area that is safe to navigate around but have dangers within the vicinity. The color combination of black and red bands is used for these marks to help mariners quickly identify the mark's purpose and significance. The black band is typically placed above the red band, with the entire mark often being a pillar or buoy shape. This distinct coloring helps distinguish isolated dangers from other navigational aids, such as safe water marks or other types of hazard markers. The black and red banding provides clear visual cues in varying conditions, which is essential for the safety of navigation on waters.