Does fragrance tend to remain longer on the paper than skin? Yes, any fragrance material stayes longer on a paper strip than on the skin.. The paper strip has room temperature. Skin is warmer. So it evaporates faster.
Oil has a lower vapor pressure then most fragrance oils so it stays longer, but it does not radiate as good as with Ethanol. ( Ethanol lifts, Oil as a carrier holds it back. We call this fixatives)
One can easily find out the odor performance of an odor substance on a paper strip.
After I wrote down the name of the substance, the date and time, I smell a fresh dipped blotter and make notes. Odor intensity and evaporation time. I check the blotter every 30 minutes. The next morning again. Me and my apprentice do this exercise every morning and during the day. This way we build up an odor memory, which is very important.
This method gives you a very good idea which of the naturals are good for the top-middle or base note.
Diluted versions don't last as long as a concentrated versions, especially when the solvent is Ethyl Alcohol.
If the solvent would be a Jojoba Oil with a low volatility factor, it would stay longer on the blotter. It also depends on the diluted version. Lets say Olibanum 1% in Alcohol will not last as long as the pure oil.
There is one thing I should mention here, there is also another force involved. The forces of adhesion, and the degree of adhesion is often designated by the term substantivity. To make this understand better, fragrance material adheres to paper better then plastic.
Adhesion plays an important role in the persistence of perfume on the skin.
Odor persistence of a perfume material depends on its volatility. The greater the volatility, the less persistence.
So if you have Oakmoss pure and Oakmoss 50% in Alcohol, the solution will not last as long as the pure substance. Although in this case there is really no big difference. 1% against 100% yes. Big difference.
To my knowledge Top - Middle and Base Notes are all related to vapor pressure of the individual components in an essential oil. Eo's are ALL a mixture of Aroma Chemicals, each with its distinct vapor pressure. This chemicals evaporate at a different rate.
High volatile components evaporate faster then the ones with low volatility.
Since all the aroma chemicals have their own distinct scent, it is clear that the odor of an EO changes on a paper strip and even faster on the skin. One example is Orange Oil. A mixture of D'Limonen ( > 90% ), and aroma chemicals in trace amounts. One is Aldehyde C-10 or Decanal. A fatty, orangy scent. It is the last aroma chemical that stays the longest on a paper strip or skin. Some people say it smells like a wet dog. (I love animals).
Middle notes have a higher VP (or Volatility) then base notes. Top notes have the highest VP (high volatility).
That means: Base notes: low VP. Low volatility. Therefore they last the longest on a blotter.
Middle notes: higher VP then base notes. Therefore they evaporate faster then the base notes.
Top notes: higher VP then middle and base notes. Therefore they evaporate faster then middle and base notes.
Consequently it is clear why Natural and all other perfumes change their scent over time.
To determine vapor pressure of aroma chemicals are not so difficult to measure and there are lots of literature about it.
To measure it in EO's is almost impossible, because they all have many aroma chemicals in it and it changes quickly.
A good way to find out how long EO's or Naturals will last on a blotter, is to test and make notes.
A natural Perfumer does not have to know what 9.8 Eugenol ( Vapor Pressure - microns at 20C )means. It is meaningless. It is more important to know how long a certain EO last on a paper strip or on the skin.
Many EO's have similar evaporation times. Like Agrumen Oils or Citrus Oils. Like Orange, Tangerine, Lemon, Grapefruit, Bergamot etc.
Highly volatile, there for excellent for Top Notes or to give lift for a compound.
Middle notes, everything that has lower vapor pressure then top note oils.
Base notes everything that last longer on the blotter the the previous one mentioned.
I do my blends in a way that I know which ones are the top note EO's and the ones for middle and base. I prefer to use the ones that "stay" together as long as possible. That means the ones that have very similar volatility factors or from observing how long they hang on a paper strip. I don't like when the middle or base notes "drift apart quickly.