Rose oil the aromatics unaltered by heat. Because CO is gas at normal atmospheric pressure, it leaves no trace of itself in the final product. The equipment for CO extraction is expensive, which is reflected in the price of the essential oils obtained from the process. It takes a large amount of rose petals to distill a small amount of essential oil. Depending on extraction method and plant species, the typical yield can be approximately 1:3,000. 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
Petals of Blood called 'Ballad of a Barmaid', it is unclear why Ngugi changed the title before release. The phrase "petals of blood" appears several times throughout the novel, with varying associations and meanings. Initially, "petals of blood" is first used by a pupil in Munira's class to describe a flower. Munira quickly chastises the boy, saying that 'there is no colour called blood'. Later, the phrase is used to describe flames, as well relating to virginity during one of Munira's sexual fantasies. One primary underlining theme in "Petals of Blood" is the failure of the ruling Kenyan elite to adequately meet the