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

# 5972FF

or triadic complementary

Heliotrope

# E659FF

and triadic complementary

Aquamarine

# 59FFE6

To a colorblind person appears

Silver

# bfbfbf