Charade

# 272A33

Shuttle Gray

# 636A7F

Mako

is a very unsaturated dark cold azure

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

Fuscous Gray

# 595445

or triadic complementary

Gray Asparagus

# 4A5945

and triadic complementary

Don Juan

# 59454A

To a colorblind person appears

Tundora

# 4d4d4d