Shark

# 1A1C1E

Shuttle Gray

# 5D646B

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

Masala

# 443F3B

or triadic complementary

Cabbage Pont

# 40443B

and triadic complementary

Tundora

# 443B40

To a colorblind person appears

Tundora

# 404040