What do you think about maximum dilution? Fairly recently, I came across this Product a Headache Pain Relief Roller Bottles by the Aussie brand Thursday Plantation. This roll-on blend just contains Peppermint essential oil and jojoba. It specifically contains 10.5% v/v of Peppermint essential oil. According to Robert Tisserand, Peppermint has a maximum dermal dilution of 5.40%, which is roughly 15 drops of Peppermint per 10ml of Fixed Oil (as per the Tisserand Dilution Guidelines for Essential Oils Infograph) So this roll on by Thursday Plantation is double to the dermal maximum. When I ran the oil in Blend Precisely, however, 15 drops of Peppermint in 10mls of fixed oil is not 5% but rather 7.89%. How would you approach these inconsistent maximum dilutions?