A sticky, gummy, even syrup-like, solid compound, which can either be synthetic or organic in origin. In perfumery, they are commonly used as ingredients in fragrances; often synthesised into other compounds first, which can have a wide array of usages in the production of many different types of perfumes. Notable examples of plant-derived resins used in perfumery include: amber, balsam, copal, elemi, and mastic. Resins have been used for thousands of years for scenting purposes, with two notorious examples being the prized substances of frankincense and myrrh.