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Absorption spectroscopy
Absorption spectroscopy refers to a wide range of techniques where one measures how much light of a particular wavelength (color) is absorbed by a sample. Since color can often be correlated with the presence and or structure of a particular chemical, and since absorbance is often an easy and cheap measurement to make, absorbance spectroscopy is widely used for for both qualitative (is a chemical present) and quantitative (how much) and structural (is it degraded) work in a wide range of fields.
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