The human aura has been scientifically proven through a method called Kirlian Photography, a type of photograph that captures the colors of the energy field surrounding a person (or any living thing, for that matter). I can't give the scientific info about auras, and this book is esoterical in nature, not a scientific type book of "proof." This book conveys the typical colors which vary during moods of anger, sadness, happiness, creativity, etc. Some people are able to see the human aura, and it is believed that anyone can learn how to see it.
Think of an aura as a halo that surrounds the entire body. Now, think of the halo having numerous layers of different colors, and you have an idea of what an aura is.
Of all the so-called psychics, Edgar Cayce has arguably been considered the "genuine article." At a time when mediums and psychics were looked upon as heathens or charlatons even moreso than today, this Christian was concerned about his undeniable abilities, how they fit in with his strong spiritual beliefs in God, and how he should or shouldn't use these skills. He decided to help others, and this book on Auras is an excellent resource I've seen used in the field by kirlian photographers who refer to his color definitions when giving kirlian photography color interpretations to their clients.
This is a small booklet type of book, but it's packed with fascinating information that is well worth the price. I'll never forget his description of the lack of auras around people on an elevator, or other scenarios describing situations that happened in his life. This book is a keeper you'll find yourself referring to time & time again. I use it to compare other books on the subject against, for quality and pertinent information.