hi there i do not no much at all about aura's bt a close friend came to me yesterday (he has actually just left my home in bits) he told me that as he was selling his big issue yesterday that an old couple came up to him then stopped dead in there tracks and said "no not him he is yellow" it totally freaked him out and he asked them what they meant and all they daid was your colour is yellow, but from what he knew his aura is blue , dose any one no if it is possible for your aura to change colour, my friend is so freaked out as he dose not no what is going on can any one shed any light on this, it would be a big help, thanks and sorry i went on so much xx0xx
Well the first thing to mention is yes. Auras change almost continually given so many different sorts of occasions, stimuli, moods etc, they're by no means a static thing. Secondly though, and in my opinion far more importantly, seeing auras is an interpretation of energy. For that reason everyone has there own opinion of what these specific energies are and see colors very different to any other individual.
Given all you said however, I'm not even convinced they were talking about an aura. The color of an aura really shouldn't persuade you of their personality like that and even if it did I highly doubt any serious practitioner would just announce it in the street. At worst I'd say that the couple were just trying to mess with his head for fun, otherwise I'd probably put it down to a slight mental health issue and leave it at that.