‘colour spectrum’ historical pictures

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Isaac Newton breaks down light
Isaac Newton breaks down light
Blue
Blue
The Heliostat
The Heliostat
The Spectroscope
The Spectroscope
Chart showing colour graduations in the spectrum of white light
Chart showing colour graduations in the spectrum of white light
Solar Spectrum and Typical Colours
Solar Spectrum and Typical Colours
The Prismatic Spectrum
The Prismatic Spectrum
Green
Green