One of the common tests that many educators, essential oil companies and consumers will conduct is a blotter test.... 21 Mar What Do Blotter Tests Reveal About Essential Oils? Sandy Powell | aldehydes, blotter tests, essential oils, esters, eucalyptus, lavender, lemongrass, ti-tree | Education, Essential Oils, Sandy's Rants | 0 One of the common tests that many educators, essential oil companies and consumers will conduct is a blotter test....