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Mst common daymarkers are green triangles and red squares. The former are equivalents to cans and the later are equivalent to nuns. They are the traffic signals and allows the ships to pass through the waterways, safely. So in this case, the triangular daymarker is green in color. 

Answer:

Red color

Explanation:

The daymark are of different shape and color. However, a particular shape of daymark is associated with a specific color only.

For example - triangle-shaped daymark are of red color while square shaped day mark are of green color.

The red color of daymark is equivalent to nuns while the green color of daymark is equivalent to cans.

The red color signifies the  correctness or righteous course while one is  returning from open waters or heading upstream.