Birch

is a unsaturated 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

Mirage

# 1B2033

or triadic complementary

# 2E1B33

and triadic complementary

# 1B332E

To a colorblind person appears

# 2a2a2a