Purple -- the ultra-violet (v.51), the most positive of the colours.
Green -- the most negative of the colours, half-way in the spectrum.
The Magical Image of Hadit is therefore an Eye within a coiled serpent, gleaming red -- the spiritual red of the Spirit of Nature, the letter Shin, not mere Fire -- at the apex of the Triangle in the half circle of Nuiot's Body, and shedding spangles as of the spectrum of eight colours, including the ultra-violet but not the ultra-red; and set above a black veil, as the next verse indicates.
There is a certain suggestion in this 'purple' as connected with 'eyesight', which should reveal a certain identity of Hadit with the Dwarf-Soul to those who possess -- eyesight!
Green -- the most negative of the colours, half-way in the spectrum.
The Magical Image of Hadit is therefore an Eye within a coiled serpent, gleaming red -- the spiritual red of the Spirit of Nature, the letter Shin, not mere Fire -- at the apex of the Triangle in the half circle of Nuiot's Body, and shedding spangles as of the spectrum of eight colours, including the ultra-violet but not the ultra-red; and set above a black veil, as the next verse indicates.