In the regions of Northern Europe, some scented materials manage to develop despite the cold. This is the case with birch, which is found in the taiga forests, especially in Sweden. As a resistant wood, it is often called the tree of wisdom. In perfumery, it is its bark that is used to deliver birch tar essence. Tar, or pitch, is a substance that is created by heating birch bark in a hermetic manner to obtain a pasty substance composed of tar and ashes from the bark. In perfumery, this wood tar essence is obtained by a long dry steam distillation of this substance. This essence evokes the olfactory sensation of a wood fire, thanks to its warm and smoky notes. This tree is generally used to reproduce leathery facets in fragrances.