Atoll

is a very saturated dark cold bluish 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

Kenyan Copper

# 771A0B

or triadic complementary

Spicy Mustard

# 69770B

and triadic complementary

Rose Bud Cherry

# 770B69

To a colorblind person appears

Emperor

# 505050