This colour name used by Ridgway and Standardised in 1934, has been in general use since 1902. A pale tint of azure favoured by Alice Roosevelt Longworth, the daughter of Theodore Roosevelt, which sparked a fashion sensation in the United States at the time. Also known as Sistine in the USA colour system.
There has been much controversy about this colour name. Some people have ascribed this name to the average colour found in Delft tiles, some to the colour predominating in Dutch paintings, including those of Vermeer of Delft. The colour here represented is the darkest blue tone found in Delft pottery, although lighter tones of a redder and lighter hue are seen in the tiles.