I will toss in my two-cents as well that the body’s chakras in reiki are attributed different colors.
The same in any sort of spiritual or crystal or candle magic metaphysical practices. There is a sort of consensus as to what each color represents such as gold and green for wealth, pink for love, yellow for fear, silver and white for truth and purity, you get the idea.
Perhaps choosing a methodology to use as a key or legend for decisions about what your character sees and it’s relevance may make it easier to plan out, as well as easy for readers to accept as many ideas about what colors represent are ingrained in us subconsciously and has reasoning we can trace back to our earliest selection of lolly pop flavors in childhood.