After a few moments, you should begin to see a glowing, whitish outline around the subject. Try not to focus on the person, only the wall. It will branch out, and you'll see colors in it. Often, it's one single color, or maybe even a motley array of them. It is the Crown Chakra.
Indigo is intuition, higher mental.
The Third Eye Chakra. Blue is communication, connections, lower mental, calmness, tired. This is the Mind Chakra. Green is for balance, healing, usually feeling good and in tune, the Thymus Chakra. Yellow means compassion, love, energy and good karma, an all-around 'happy' color.