In 1939, Russian electrical engineer Semyon Kirlian and his wife Valentina developed Kirlian photography after observing a patient in Krasnodor Hospital who was receiving medical treatment from a high frequency generator. They had noticed that when the electrodes were brought near the patient's skin, there was a glow similar to a neon tube.
Put it simply, they developed photography to show energy that you can feel but can't see. Like electricity, you can't see it, but you sure can feel it. Our nervous system has a high frequency, low voltage electricity, which is how we get massages to our brain in lightening speed.
In these two pictures it shows that after ear candling, the body has more energy flowing through it.