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Extract. An extract is a mixture of an essential oil and a medium--usually alcohol--that helps carry the flavor. You can make peppermint oil either by soaking peppermint leaves and stems in alcohol and allowing the alcohol to absorb oil--extracting the flavor from the plant--or by diluting peppermint oil with alcohol.
Answers. Best Answer: Oil, but the difference is not huge: (Oil: refractive index is about 1.5. Water has a refractive index of about 1.3). But the reason is not easy to explain. Oil slows light down more than water, but that is not quite an explanation.A table of various refractive indices can be found here: http://www.robinwood.com/Catalog/Technic...Very roughly speaking, one could say that there is more interaction between the molecules in oil and the light, than with water and light.ut the reason is not easy to explain. Oil slows light down more than water, but that is not quite an explanation. A table of various refractive indices can be found here: http://www.robinwood.com/Catalog/Technic...