In A Blue Robe. To St. John Comments

Blue is a sky color which might explain its spiritual associations. It's also the color of the oceans which are reflecting the blue of the sky and that makes earth THE BLUE PLANET. You are citing the blue of St Johns robe and the Virgin's. You have white linked to black via the color of innocence and the color of nun's habits. But there another color present but invisible to human eyes - The transparency of Light itself.