Adulteration
It takes many pounds of rose petals to distill one ounce of essential oil. Depending on extraction method and plant species, the average yield can range from 1:1500 to 1:10000. To mitigate the cost, some dishonest dealers will dilute rose oil with geranium (Pelargonium graveolens) or Palmarosa (Cymbopogon martinii) essential oils, both of which are rich in geraniol, the main constituent of rose oil. Some of these 'rose oils' are up to 90% geranium or palmarosa to 10% rose. This is referred to as extending the Rose fragrance. This may be done to compensate for chemotype, e.g. Bulgarian distilled Rose oil is naturally low in phenylethanol, and Ukrainian or Russian rose oil is naturally high in phenylethanol.
How to make rose oil ? (video)
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“The condition every art requires is, not so much freedom from restriction, as freedom from adulteration and from the intrusion of foreign matter.”
—Willa Cather (1876–1947)