Enhancing Fragrance Longevity in Soap

To make the scent of your liquid soap, HP, or CP soap last longer on the skin, the most significant factor is the type of fragrance you choose. Selecting a high-quality fragrance specifically designed for soap applications and known for its longevity is key.

While ingredients like Dipropylene glycol can act as a fixative by helping to dissolve the fragrance and slow down its evaporation rate from the fragrance concentrate itself, their ability to make the scent last significantly longer on the skin after washing is limited.

It's also important to consider the stability of the fragrance within the soap base, especially in high-alkaline bar soaps (HP/CP). Some fragrance components can break down in high pH environments, causing the scent to fade from the soap over time. Ingredients like Glycerin contribute to the soap's composition, but the primary challenge for fragrance longevity in bar soap is the alkaline condition.

Although fixatives like Dipropylene glycol or Propylene Glycol (which was mentioned as an alternative to consider for bar soap) can offer some minor assistance in preserving the scent within the soap, they do not dramatically change how long the fragrance remains noticeable on the skin after rinsing. The inherent longevity of the fragrance material itself is the dominant factor.

In summary, focus on selecting a durable, soap-stable fragrance rather than relying heavily on fixatives for scent longevity on the skin.