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There are basically four different types of buoys we might encounter in US waters: Red, green, red and green horizontally striped, and red and white vertically striped. We will talk about special buoys further below. Each one may or may not have a light. The light color will be green, red, or white. Lights are often used where greater caution must be exercised such as a bend or narrowing of a channel. Also, especially in areas where fog may exist, some buoys make sounds such as a whistle, bell, or gong. Green and red buoys.
As natural weathering proceeds, the metal exposed to the atmosphere changes in hue from the natural salmon pink color through a series of russet brown shades to light and dark chocolate browns and finally to a dark, dull slate gray or sooty black from which the ultimate blue-green or gray-green patinas spring.