Deep, dark, rich blue, almost but not quite purple.
Persian Indigo is a deep blue, close to purple.
It can be described as deep, rich, dark and dim.
Set in white, because white reads best on it.
Persian blue comes in three major tones: Persian blue proper: a bright medium blue; medium Persian blue ; and a kind of dark blue which is referred to as Persian indigo, dark Persian blue, or regimental, that is much closer to the web color indigo.
Read on WikipediaIndigo is a term used for a number of hues in the region of blue. The word comes from the ancient dye of the same name. The term "indigo" can refer to the color of the dye, various colors of fabric dyed with indigo dye, a spectral color, one of the seven colors of the rainbow as described by Sir Isaac Newton, or a region on the color wheel, and can include various shades of blue, ultramarine, and green-blue. Since the web era, the term has also been used for various purple and violet hues identified as "indigo", based on use of the term "indigo" in HTML web page specifications.
Read on WikipediaNoun
Adjective