Swamp

# 000505

Evening Sea

# 055150

Tiber

is a very saturated very 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

Sepia Black

# 2B0303

or triadic complementary

Madras

# 2B2A03

and triadic complementary

Mardi Gras

# 2A032B

To a colorblind person appears

Cod Gray

# 1d1d1d