Firefly

is a saturated very dark cold bluish cyan

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

Coffee Bean

# 2B0C0D

or triadic complementary

Onion

# 2B2A0C

and triadic complementary

Valentino

# 2A0C2B

To a colorblind person appears

Mine Shaft

# 202020