Western conventional colors Indigo
Western conventional colors 
British traditional colors What is Jaguar Indigo Blue? An explanation of this historical British color and color scheme.
Traditional Italian colors What is Blu di Genova? An explanation of the origin, history, and color scheme of this traditional Italian color.
Traditional Italian colors What is Indaco? An explanation of the origins, history, and color schemes of this traditional Italian color.
Traditional French Colors What is Carmin d'Indigo? An explanation of the origin, history, and color scheme of this traditional French color.
Japanese Color Encyclopedia