What gave the name to the indium chemical element?

country of India
city of Indianapolis
Indigo dye
its chemical indifference
In 1863, the German chemists Ferdinand Reich and Hieronymous Theodor Richter found a blue line in the spectrum of tested minerals. As no element was known with a bright blue emission, they concluded a new element was present, and they named it from the indigo color in its spectrum.
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Luca Biaggi
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