Hydration
We are mostly water, hydration affects everything in our body, including our biggest organ, our skin. The more hydrated the skin, the better first immune line we have, the longer the fragrance will last.
Skin pH
pH, potential of Hydrogen, has a range of 1-14 with 7 being Neutral, below 7 is Acidic, Above 7 is Basic or Alkaline. Human skin has a pH range of 4-6 with average pH of 4.7. Dry skin’s pH is typically above 5.5. Oily skin’s Ph is below 5.2.
Skin’s pH is a mixture of water and sebum “hydrolipidic film”. The suppler the skin is, the better the fragrance will hold.
Activity, Sweat and Bacteria
Sweating and the bacteria on skin react with perfumes, depending on the body chemistry. The degradation may be positive or negative, depending on each specific fragrance. In addition to heat that also have a direct impact on how perfumes would smell.
Olfactory Heritage
A fragrance triggers memories that are unlocked by scents. Depending on each’s history, the fragrance will their olfactory heritage. Smelling sweets vs distinguishing the caramelized crystals of sugar from the sweat baked pies, your smell library will dictate your fragrance.
Food
Eat sausages and smell like sausages for days. What you eat is what your body will decompose and release, reacting with the perfume you use.
Skin Color
Fragrance react differently with skin tones. For example, oriental notes are absorbed more on darker skin tone while fairer skin tones absorb the citrus and green notes better.
An example is why Arabian fragrances are more into musk, oud, and amber while European fragrances are more into floral, fruits and greens.
Hormones
If dogs and cats and other animals can smell our hormones' change, then hormones can also affect how a fragrance would smell.
