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Indigo dye
Indigo dye
Indigo, historical dye collection of the Technical University of Dresden, Germany
Indigo, historical dye collection of the Technical University of Dresden, Germany
Cake of indigo, about 2 cm
Cake of indigo, about 2 cm
Indigo factory at Allahabad, India, drawn by Émile Thérond [fr], 19th century
Indigo factory at Allahabad, India, drawn by Émile Thérond [fr], 19th century
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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