Measuring SRM in home-roasted grain - Home Brew Forums
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Old 06-25-2013, 12:15 AM   #1
Delaney
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Jul 2011
Montreal, Quebec
Posts: 499
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Hey,

I'm just curious as to how SRM is calculated for grains, with respect to my home-roasted specialty grain. I work in a laboratory and have access to spectrophotometers with 1cm wells.

I know that the asborbance is measured at 430nm, but what is the calculation to convert that absorbance to SRM or EBC?

Cheers,

Delaney.



 
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Old 06-25-2013, 01:50 AM   #2
ShootsNRoots
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Mar 2013
Posts: 244
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SRM = 12.7 * D * A430

12.7 = constant
D = 1.0 for undiluted sample; 2.0 for 1:1 dilution; etc...
A430 = the absorbance at 430 nm in 1 cm

http://en.wikipedia.org/wiki/Standard_Reference_Method

 
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