Ebony

# 0E0B23

Astronaut

# 2C2570

Valhalla

is a saturated dark cold blue

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

Thatch Green

# 444918

or triadic complementary

Parsley

# 18491D

and triadic complementary

Cedar

# 491D18

To a colorblind person appears

Mine Shaft

# 2a2a2a