Mustard

is a saturated very 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

Dodger Blue

# 5B76FF

or triadic complementary

# E35BFF

and triadic complementary

# 5BFFE3

To a colorblind person appears

# bfbfbf