Spectroscopy- To Find the Correct Absorbance

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Herbal extracts in DPPH (test for radical scavening ability), also in EtOH . But for some extracts (ex:grape seed) it already has a yellow/light color  

DPPH is tested by turning from purple 2 yellow- to find absorb., do I subtract DPPH ab - EtOH ab. 

Oct 16th, 2017

Yes

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Jan 6th, 2015

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