Every organ, gland and the human body system are related to a chakra and each is connected to a frequency of color. For example, the heart chakra (Anhatha) works with the thymus, lungs and bronchi and its color is green.
There are seven main chakras and they are aligned along the spine. In case of imbalance (at any level, which is perceived by our chakra) will affect the various body parts, that are related to its corresponding chakra. To achieve balance in the affected parts of the body or chakra, we need to work with the color that corresponds (through Reiki, color therapy and other methods).