For example, many customers purchase lavandula oil, also known as lavender, because of its calming effects. A common mistake is purchasing lavender oil instead, which has the opposite effect and will make the user more alert.
If you’re testing multiple oils, it might help to label each one so you remember where it is on the paper.
Some oils that are darker in color will leave a slight tint, but the paper should not be oily or greasy once completely dry. Oils such as sandalwood, patchouli, and German chamomile will leave a tint but not an oily ring.
The two means of testing are Gas Chromatography and Mass Spectrometry. These tests are often performed together in a lab, and will show whether there are any “adulterants” in the oil. [9] X Research source
