Ultramarine

# 0A10AF

Blue

# 0F17FC

Dark Blue

is a very saturated very light cold blue

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

Bitter Lemon

# D6CF0C

or triadic complementary

Green

# 13D60C

and triadic complementary

Monza

# D60C13

To a colorblind person appears

Emperor

# 525252