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
Attar of Nishapur the natural sciences. According to Edward G. Browne, Attar as well as Rumi and Sana'i, were Sunni as evident from the fact that their poetry abounds with praise for the first two caliphs Abu Bakr and Umar ibn al-Khattāb - who are detested by Shia mysticism. According to Annemarie Schimmel, the tendency among Shia authors to include leading mystical poets such as Rumi and Attar among their own ranks, became stronger after the introduction of Twelver Shia as the state religion in the Safavid Empire in 1501. In the introductions of "Mukhtār-Nāma" () and "Khusraw-Nāma" (), Attar lists the titles