Black

# 000000

Madras

# 243300

Cerulean

is a very saturated very dark warm greenish chartreuse

Green is the color of nature and health. It represents growth, nature, money, fertility and safety. Green is a relaxing color that is easy on the eye and has a healing power to it.
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That goes well with

Black Russian

# 03000C

or

Diesel

# 0C0009

and

Swamp

# 00090C

To a colorblind person appears

Cod Gray

# 080808