In her article Kathi Keville says:
"The citrus oils have the shortest shelf life of all essential oils and are best used within one year. The longest-lasting oils, which improve as they age, tend to be the thick resins such as frankincense and myrrh, woods such as sandalwood, roots like vetiver, as well as other oils, including spikenard and patchouli."
Since you are from Turkey, would you mind answering following questions:
- How does Daphne essential oil smell like and why is it difficult to find this oil? I know it is used in soaps as fragrant, but is it harmful to apply on skin in its undiluted form?
- Hod do you compare Turkish roses to Moroccan and Bulgarian?