The color of your Soul appears in your aura. It probably won’t change much in his lifetime. The color of your soul is determined by the Ray your Soul incarnated on during this lifetime.
There are 7 rays in which we can incarnate, all these rays have a color or colors, and they have attributes. These attributes are gifts that we receive to help us in this lifetime to learn and master the lessons that we have set for ourselves. The 7 rays are a perfected aspect of the Christ Consciousness. Our incarnation on any of the rays is our attempt to reach the fullness of the ray and the fullness of that aspect of Christ Consciousness.
Of course that is much more complicated. When we incarnate, we incarnate on 5 of the 7 possible rays, because we incarnate not only on a soul ray, but also on a personality ray, and on emotional, mental, and physical/etheric rays. These 5 rays will have different colors and are all part of our aura.
It is interesting to know what 5 rays we have in this life time, to have a better understanding of our own path and Mastery of it.
The 7 rays, their colors and basic attributes are:
1 – Blue – Personal power, Will of God over free will.
2 – Yellow – Wisdom, humility.
3 – Pink – Love, creativity.
4 – White – harmony through conflict, purity.
5 – Green/orange – truth, knowledge, healing.
6 – Purple / ruby / gold – service, compassion, devotion.
7 – Purple – Transmute.
So how do you know which soul ray you have incarnated on? It’s not as easy as color preferences. I know two women who have incarnated on the 5th ray, the green ray, one loves green and the other hates it. We also cannot assume that all healers are on the fifth ray. If you do not intuitively know your rays and colors, it is best to seek clarification from a qualified clairvoyant, who is knowledgeable about rays and can see auras down to soul level.