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

# 210E0B

or triadic complementary

Woodrush

# 1F210B

and triadic complementary

Tamarind

# 210B1F

To a colorblind person appears

Cod Gray

# 191919