Auras...

There's many different theories about what the different colors in auras can mean. For instance, I've heard some people say black is a sign of death, some say it's a sign of vampirism, and some say it's a sign of immense power and psychic ability in an aura. What I've learned mostly in noticing your own personal vibes to the aura is usually the most helpful way of interpreting it. You could also do more research into the different symbolisms of the colors and decipher which one seems to be the most valid. So, google away, and good luck. : )

I just did a little aura exercise on my hand, I'm new at this, I saw like a solid yellow border around the part of my hand I was looking past
Yesterday the border was green, can it change?