Many Elbaite crystals show more than one color in a clear rainbow ordered spectrum. Yellow and orange angle a little but red, the longest wave, bends the most. Warm Magenta is outside the red on the rainbow, and is the last color seen before the dark of night. This is color diffracting, in real time, focusing on a spot inside the shadow's void behind the earth, the center of diffraction. Diffraction also is the only way to see the atmospheric light color magenta in it's pure state.
Diffraction is what happens to a ray at it's light stopping edge, stopped by an object, it bends.
The longest wavelength color can make the greatest diffracted angle. Magenta waves are still angling out of the straight white light already passed the stopping edge of the earth. They are moving in the shadow area on there way to a principal focusing point on the center line's axis, deep in the heart of the earths shadow. The interferometer combines and separates magenta and green light with a clear band of no light, yellow and cyan are in the green light, red and blue are in the magenta light. The whole spectrum is represented by four bands, magenta, white, green, and clear.