Firefly

is a very 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

Graphite

# 300F0A

or triadic complementary

Turtle Green

# 2A300A

and triadic complementary

Loulou

# 300A2A

To a colorblind person appears

Mine Shaft

# 212121