Sapphire

# 313F96

Royal Blue

# 4A5FE2

Indigo

is a saturated 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

Roti

# BCAB3E

or triadic complementary

Apple

# 4FBC3E

and triadic complementary

Chestnut

# BC3E4F

To a colorblind person appears

Dove Gray

# 6e6e6e