This is likely to be the last of my rambles on colour symbolism, for which you’ll probably be grateful!
The opposite of black both literally and figuratively, white is the equal presence of light from all colours of the visible spectrum, brightness without hue. It is unblemished, and has become a strong metaphor for purity and perfection. Religious thought has further extended this image of purity into a whole range of different interpretations. These are dominated by the theme of goodness: virtue, sexual abstinence, innocence, obedience, truth, sincerity, reverence, cleanliness and humility. Other auxiliary associations include understanding and protection – peace, unity with God, wisdom, enlightenment and youth – and joy, happiness, glory, purpose and so on. In religious imagery, white dominates depictions of heaven, saints, angels and God Himself, because it is perfect and untainted.