" You see, I’ve read Mr. Grumbine’s treatise on auras, and while it does depend on the shade, a green aura can be a mark of deception or dishonesty.”
I shoot Kiernan a smug glance. While I’m certain this aura stuff is total bunk, he and Prudence both see the light as green. “Does this Mr. Grumbine say anything about blue auras?”
“Again, it depends on the shade. But it’s usually associated with truth. "

― Rysa Walker , Time's Divide (The Chronos Files, #3)