Onion

is a saturated very dark 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

Black

# 0E1230

or triadic complementary

# 2C0E30

and triadic complementary

# 0E302C

To a colorblind person appears

# 232323