The colour of the solution is Green.
How does spectroscopy work?
The science of spectroscopy involves analyzing electromagnetic spectra as a function of the wavelength or frequency of the radiation that are produced when electromagnetic radiation interacts with materials.
Lower wavelengths in the visible spectrum, which has a wavelength range between 400 and 700 nm, are equivalent to the violet side of the rainbow spectrum, while higher wavelengths are equivalent to the red side. The violet and red portions of the spectrum should be absorbed by our solution and not be visible because our solution absorbs heavily at about 440 and 600 nm. Green should consequently be the hue that can be seen from the solution because it has the lowest absorption at about 520 nm.
Green is absorbed at a wavelength of 500 nm. This indicates that it will absorb green and display red, which is red's complementary colour.
This is an allusion to spectroscopic techniques that calculate the amount of radiation absorbed in relation to frequency or wavelength when it interacts with an object. For absorption spectroscopy, the complete electromagnetic spectrum is utilized.
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