Kelp

is a unsaturated dark warm greenish yellow

Yellow is the brightest color to the human eye. It represents youth, fun, happiness, sunshine and other light playful feelings. It is a cheerful energetic color.
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Goes well with complementary color

Blackcurrant

# 322D42

or triadic complementary

Thunder

# 422D3D

and triadic complementary

Outer Space

# 2D3D42

To a colorblind person appears

Mine Shaft

# 393939