Spectroscopist observing (top). Bottom, left to right, Absorption spectra of Indigo, Chromic Chloride, and Magenta. Lithograph.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., absorption, archival, archive, bottom, chloride, chromic, historical, history, indigo, left, lithograph., magenta., observing, science, spectra, spectroscopist, spectroscopy, top