Black

# 000000

Te Papa Green

# 233F3A

Black

is a unsaturated very dark cold cyan

Blue is a cool calming color that shows creativity and intelligence. It is a popular color among large corporations, hospitals and airlines. It is a color of loyalty, strength, wisdom and trust. Blue has a calming effect on the psyche. Blue is the color of the sky and the sea and is often used to represent those images.
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Goes well with complementary color

Gondola

# 190E10

or triadic complementary

Rangoon Green

# 19170E

and triadic complementary

Cinder

# 170E19

To a colorblind person appears

Cod Gray

# 151515