Taken from http://www.color-wheel-pro.com/color-meaning.html and http://monkeycmedia.com/blog/?p=61
Red
Red is the color of fire and blood, so it is associated with energy,
war, danger, strength, power, determination as well as passion, desire,
and love.
Red is a very emotionally intense color. It enhances human metabolism,
increases respiration rate, and raises blood pressure. It has very high
visibility, which is why stop signs, stoplights, and fire equipment are
usually painted red. In heraldry, red is used to indicate courage. It
is a color found in many national flags.
Red brings text and images to the
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