Black

# 000000

Prussian Blue

# 00364C

Swamp

is a very saturated very dark cold azure

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.
Download swatch.ase

That goes well with

Nero

# 260A00

or

Deep Fir

# 1B2600

and

Toledo

# 26001B

To a colorblind person appears

Cod Gray

# 161616