| optical rotation |
Optical rotation is one of the objective tests performed by Frontier to determine the purity of every essential oil. A sensitive scientific instrument (polarimeter) measures the degree a light ray bends when it is passed through a column of oil. The reading is compared to established standards; significant deviation from the standard may indicate impurities and give cause for further investigation.
출처: www.frontiercoop.com/learn/glossary.html
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