Kewra Ruh (Oil) this is 100% pure oil extracted from male Kewra flowers. It takes about 1,000 flowers to produce one ounce of Kewra Ruh. In Ayurveda, the oil is used as a stimulant, and to treat rheumatoid arthritis. Kewra Attar (Perfume) the Kewra flowers are distillated into sandalwood oil. Kewra Attar has about 3% to 5% Kewra oil, and the remainder is Sandalwood oil. Normally, it is specified in terms of number of flower spikes (10,000 to 15,000) per pound of sandalwood oil.