River Bed

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

Kabul

# 5B5143

or triadic complementary

Axolotl

# 4E5B43

and triadic complementary

Eggplant

# 5B434E

To a colorblind person appears

Emperor

# 4f4f4f