Indigo

is a 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

Sundance

# C1AC57

or triadic complementary

Mantis

# 6CC157

and triadic complementary

Fuzzy Wuzzy Brown

# C1576C

To a colorblind person appears

Gray

# 818181