Thicker Oud oil being a sign of purity is the most common myth and misunderstood belief that needs to be addressed.
Deeply entrenched in Middle Eastern culture and tradition, Oud is symbolic of opulence and prosperity. In recent years, the western fragrance markets have realized the importance of oud fragrances and the essence it holds in the Arab markets, with luxury boutique fragrance houses creating oud inspired scents.
Oud, or Agarwood is the common name for the tar-like resinous heartwood that forms in the ancient Aquilaria and some Gyrinops species of trees, native to the dense forests of South East Asia. The heartwood of these trees produces a dark aromatic resin as part of its natural defense mechanism against a fungus infection.
The purity of oud is marked by its fragrance. A genuine product has a very powerful yet subtle and spiritual aroma. A trained nose, however, could easily differentiate between an authentic oud and a synthetically manufactured one on contact. Synthetic or diluted oud has a dull, unsophisticated, basic and leathery aroma. If one is accustomed to pure oud, synthetic oud is sure to make your head ache within seconds.
During the oud oil extraction process from the wood, the cooking or distillation method used on it and the type of wood used, largely affects the viscosity of the oud oil. Distillation methods such as steam produce stickier and denser type of oud oil, though this is not perpetual. Hence, it cannot be attributed to purity.