What additives would make a scent last longer?

Hello,

I am having some difficulty creating perfumes that lasts for more than 4 or so hours. I have experimented with several different formulas that contain base notes such as patchouli, angelica root, oakmoss, frankincense, myrrh or benzoin and might also contain musk X or combinations of these. I made sure the formulas were 25% - 40% essential and fragrance oils.

I have put a drop of undiluted oakmoss and musk X on a blotter and they still smell quite nice more than 36 hours later. They don't seem to have the same staying power when diluted in a perfume.

Does the addition of glycerin to the perfume alcohol help extend it?

Any advice on how to make longer lasting perfumes would be greatly appreciated. Thank you.

TGS

Thank you for your response and I apologize in advance for my response that clearly comes from a confused novice...

Yours is a very good question and one that I am finding more and more difficult to answer. The reason for this is that I have been diluting many of my oils before using them as many of them are extremely overpowering or too thick to use in pure form. I have found it necessary to dilute some oils more than others. I am not sure how to calculate ratio when some oils have been diluted and some have not.

For example, if I have used 3 parts of a base note that has been diluted 10 to 1, 1 part of a middle note that has been diluted 2 to 1, and 1 part of an undiluted top note how do I calculate ratios of base to heart to top notes?

I guess the core question is do ratios only work when all oils are in their pure form or, is ratio independent of the amount an oil has been diluted?

I have been diluting my oils in perfume alcohol before adding to a formula. Is that ok or should I be diluting them in a carrier oil?

I am a bit embarrassed to ask these questions because even in writing them I feel I am way off on some likely basic concepts but I am sure glad this forum is here so I can ask them.

Thank you for the info. I know this is not an exact science but I need to present a scenario with some questions so I can better understand.

So, imagine we are making 1/8 oz of alcohol based perfume. Of this 1/8 oz, 35% (for this example) needs to be EO and the remainder alcohol. There are 75 drops in 1/8 oz so, 35% of 75 drops would be about 26 drops. So, there needs to be 26 drops of EO and 49 drops of alcohol in 1/8 oz perfume.

Using your 55% base note, 20% heart note and 25% top note example, of the 26 drops EO, 14 drops (55% of 26) would need to be base notes, 5 drops (20% of 26) heart notes and 7 drops (25% of 26) top notes.

I am finding it difficult to cover the strength of 15 base note EOs with so few drops of heart and top EOs. How is this done?

Even if the odor of the base notes is strong but the tenacity is low, the aroma would still not last a long time, right? If there are a limited number of base note EOs with a long tenacity, does every natural perfume end up smelling alike if they all use them? is this where chemicals work better?

Also, if some EOs are diluted 10% and only a percentage of a whole drop is being used then does the remaining percentage need to be made up by some other diluted EO or EOs to make a whole drop? In other words, does there need to be 3 drops of a 10% diluted EO + 2 drops of another 10% diluted EO + 5 drops of an additional 10% diluted EO to equal 1 drop? Or, do the 10% diluted drops count as whole drops? I think you answered this but if diluted EOs are used it seems to force the necessity to use other diluted EOs simply to make whole drops.

Any clarification and help would be greatly appreciated.

Good points--thank you