Persian indigo is a color also known as regimental, a name that is seldom used today. It was called regimental because, in the 19th century, it was commonly used by many nations for navy uniforms. Persian indigo is named for an association with a product from Persia: Persian cloth dyed with indigo. The first recorded use of regimental (the original name for the color now called Persian indigo) as a color name in English was in 1912.
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