Some assessors restrict this to 0.6% in a leave on product.
Records show that this was a trading item in the Middle East in the pre Christian era.
Used in Ayurvedic medicine and in Japan as incense as well as medicine.
China imported it from the Red Sea area as did the Egyptians.
Has been used for centuries as a fixative in perfumes and soaps.
Elizabeth I was very fond of a perfume made from the dried, powdered resin.