Shuttle Gray

is a 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

Sandstone

# 7C6D5D

or triadic complementary

Limed Ash

# 6C7C5D

and triadic complementary

Falcon

# 7C5D6C

To a colorblind person appears

Dove Gray

# 6c6c6c