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

Paco

# 3A0F11

or triadic complementary

Camouflage

# 3A380F

and triadic complementary

Valentino

# 380F3A

To a colorblind person appears

Mine Shaft

# 2b2b2b