The color indigo is the color of intuition and perception and is helpful in opening the third eye. It promotes deep concentration during times of introspection and meditation, helping you achieve deeper levels of consciousness. It is a color which relates to the "New Age" - the ability to use the Higher Mind to see beyond the normal senses with great powers of perception. It relies on intuition rather than gut feeling.
Indigo is a deep midnight blue. It is a combination of deep blue and violet and holds the attributes of both these colors.
Service to humanity is one of the strengths of the color indigo. Powerful and dignified, indigo conveys integrity and deep sincerity