She could see the full spectrum — of my true colors
Play on words. Psyonik uses science to explain how Mica is able to understand who he really is. To understand this line even more you would have to understand what is a full spectrum.
A Full-spectrum light is light that covers the electromagnetic spectrum from infrared to near-ultraviolet, or all wavelengths that are useful to plant or animal life; in particular, sunlight is considered full spectrum.
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