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Periwinkle flowers
Periwinkle flowers
Ultramarine pigment
Ultramarine pigment
Bluebonnet flowers
Bluebonnet flowers
International Klein Blue pigment
International Klein Blue pigment
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A piece of indigo plant dye from India, about 6 cm (2.5 in) square
A piece of indigo plant dye from India, about 6 cm (2.5 in) square
Indigo extracted from woad
Indigo extracted from woad
Newton's observation of prismatic colors: Comparing this to a color image of the visible light spectrum shows that "blue" corresponds to cyan, while "
Newton's observation of prismatic colors: Comparing this to a color image of the visible light spectrum shows that "blue" corresponds to cyan, while "indigo" corresponds to blue.
Indigo bunting
Indigo bunting