Indigo

is a saturated light 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

Tussock

# BC903E

or triadic complementary

Apple

# 6ABC3E

and triadic complementary

Blush

# BC3E6A

To a colorblind person appears

Boulder

# 777777