Formulating Floating Fragrance Drops for Water Surface Diffusion

Question

I want to create fragrance drops that can be added to water for scent diffusion. Currently, I have mixed the fragrance with water and a solubilizer until it is clear. However, when testing by dropping it into a container of water, the mixture sinks and mixes with the water instead of floating.

I am looking for ingredients that will help the fragrance form a film on the water's surface, allowing it to float and diffuse without sinking.

I have already purchased the following materials:

Phenethyl Alcohol, Phenyl Ethyl Alcohol (FEMA-2858)
Methyl Dihydrojasmonate, Hedione (standard)

Will these two ingredients help with the floating and film formation on the water surface?

MySkinRecipes Expert · Accepted Answer

To create fragrance drops that float and form a film on the water surface for scent diffusion, the key is to avoid "solubilizing" the fragrance. When a fragrance is made water-soluble (clear in water), it will naturally mix with the water when dropped in, causing it to sink and disappear.

Regarding the ingredients you purchased:

Phenethyl Alcohol (PEA) and Methyl Dihydrojasmonate (Hedione): These are aroma chemicals used to enhance the scent profile.
- Phenethyl Alcohol provides a clean rose note and has mild preservative properties.
- Hedione is excellent for increasing the "diffusion" or "throw" of the scent, making it feel more airy and expansive.
- Conclusion: These help with the smell and its reach, but they do not help the mixture float or form a surface film.

How to make the fragrance float and form a film:

You need to use a carrier that is lighter than water and hydrophobic (water-repelling). Instead of using water or solubilizers in your concentrate, use one of the following:

Isopropyl Myristate (IPM): A very popular solvent in perfumery. It is light, non-greasy, and helps the fragrance spread quickly across the water surface.
Cyclomethicone (Cyclopentasiloxane): A volatile silicone that is much lighter than water. It creates an excellent thin film on the surface and helps the fragrance evaporate into the air more effectively.
Caprylic/Capric Triglyceride: A light, odorless oil carrier if you prefer a more natural-derived oil base.

Recommended Formulation:

Fragrance Blend (including your Hedione and PEA): 10-20%
Isopropyl Myristate (IPM) or Cyclomethicone: 80-90%

Instructions: Simply mix your fragrance and aroma chemicals directly into the IPM or Cyclomethicone. Do not add any water or solubilizers. When you drop this mixture into water, it will stay on the surface, spread out into a thin film, and release the scent beautifully.