Red 40 is also known as Allura Red. Peak absorbance, 504 nm (blue-green). NaO `ONa Erythrosine, also known as Red 3; peak absorbance 530 nm (green). NaO N= ‚N- Nao- -N=N° s-ONa

Q: Lille 4 2 PPM 0.

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A:

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.