It happens to me when I get close to somebody, to sense their "color". It's not aura and it's not something I can see with physical eyes. It's something which has the core in the middle dantian (between heart chakra and throat chakra).
By now, most of the people I've "seen" has white core surrounded by blue energy.This blue energy includes all parts of the body and it's flowing even through blood vessels. It can be cyan-blue or dark blue. Sometimes, rarely, I see people with "gold" energy. The core is white-gold, like sunlight, and the rest is kind of the same, a bit more yellow and often mixed with green.
In the latest years I've been searching in books and asking people about those things. Found nearly nothing relevant.
My question is: what is the meaning of the colors and how can I come to a better understanding of what I see?