In Chinese culture, red is considered a propitious color.
Red, I always thought stood for the color of blood.
Black for the color of death
And gold for the color of God (sainthood)
Think of the color of vestments of the priest and on what days they are worn.
Red -- martyrs feast days
Black -- used to be used at funerals -- now they use white
White -- is used at Easter and special Church Holidays, some saint's days.