I have access to a spectrophotometer at work and would like to imperically determine the color of my brews. I know that SRM is calculated using absorbance at 430nm, but when? As pre-fermented wort or as final, out of the bottle beer? does it matter?
I'd say fermented beer would be the best. Probably crash cooled and degassed too.
I know people cite the usual "measured at 430nm through a 1cm cuvette" bla bla bla. Is this backed by a standardized white substrate? Backed by nothing?
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