A more meaningful statistic was finding the one color that was used most frequently per chakra. The most frequently used color for the first chakra was pure, deep red, similar to fire engine red. Red is an expression of vitality, nervousness or excitement, and glandular activity. Clear red in the aura indicates force, vigor and energy. Red projected onto the body stimulates the liver and build red blood cells.
The second chakra was nearly a 3-way tie: eight times with indigo light, seven times with a yellow-orange that is best described as amber, and seven times with a green color that is just a shade lighter than lawn green. Indigo is an analgesic and a sedative; it reduces the pain from swelling, and reduces overactivity of the thyroid gland and heart, allowing deeper sleep.
Violet is a spiritual color. In those who are overexcited, it will calm the nervous and motor systems and relax the nerves. Specifically, it stimulates the spleen to build more white blood cells. Like indigo it cools the fire of the heart and allows for deeper sleep. Indigo and violet are similar to lavender, in that they help fight infection.
Yellow is a stimulating color to the nervous system, and as such is good for paralysis and neuritis. It stimulates the liver and gallbladder, aiding in elimination of parasites, such as pinworms and liver flukes. It stimulates and builds the pancreas, eyes and ears.
Orange stimulates the immune system. It is a stimulant to the lungs, thyroid and thymus. It decreases menstrual cramps, and helps increase discharges. It draws boils, abscesses and pus to a head. I was particularly struck by how infrequently the color orange was used. Yet, saffron orange seems to be the color of choice among yogis for their robes. In Ayurvedic medicine they say that orange should be used in conjunction with celibacy in order to transform sexual energy into Supreme Consciousness. Among householders, orange's healing properties are used restrictively because it increases ovum and sperm production. The over use of orange, excessively stimulating sexual energy, could result in the depletion of vital energy.
The third chakra most frequently tested for a very light, seafoam green. I believe this color calms agitation and aids digestion by increasing parasympathetic and decreasing sympathetic activity though its action on the solar plexus.