Red is the color of heat, passion, love, life and life-giving energy, and for this very reason red became the symbol of the resurrection – the victory of life over death. But at the same time it is the color of blood and torments, and the color of Christ's sacrifice. Martyrs are depicted in red clothing on icons.
Blue is usually associated with heaven, majesty, the mystical life, and mystery. It is associated with the sky and thus the infinite and everlasting world. It is often used on Christ's outer garment. A darker blue is associated with the Mother of God, who brings together the terrestrial and celestial.