This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
A volatile oil distilled from the fresh flowers of Rosa damascena.
Characters. - Pale yellowish, with a strong odour of rose, and a sweetish taste.
Test. - When slowly cooled to near 10° C. (50° F.) the oil becomes a transparent solid, interspersed with numerous slender shining iridescent scale-like crystals. When rapidly cooled to 12.5° C. (54.5° F.) it congeals to a solid mass of light feathery shining scales or plates.