The measurement of absorbance is used to determine the amount of color that is found in solution.
420 nm is used to determine the amount of yellow and brown color in a wine.
520 nm is used to determine the amount of red color in a wine.
430 nm is used used to determine beer color by converting to the Standard Reference Method (SRM) System. The scale is generally from 2 to 40+ depending on the beer style.
(Units: Au, Technique: Spectroscopy)