Bitter

is a very unsaturated light warm redish yellow

Yellow is the brightest color to the human eye. It represents youth, fun, happiness, sunshine and other light playful feelings. It is a cheerful energetic color.
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Goes well with complementary color

Waterloo

# 81818E

or triadic complementary

Venus

# 8E818E

and triadic complementary

Gunsmoke

# 818E8E

To a colorblind person appears

Gray

# 8a8a8a