Dark Blue

is a very saturated very dark warm 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

Blue Charcoal

# 000411

or triadic complementary

Black Russian

# 0D0011

and triadic complementary

Swamp

# 00110D

To a colorblind person appears

Cod Gray

# 0a0a0a