Guaiacwood essential oil is extracted by steam distillation process from the broken wood and sawdust of the plants. Guaiacwood is an ornamental evergreen tree with pretty rich  blue  flowers and the trunk is greenish-brown in color. It is traditionally used for treating rheumatish and rheumatoid arthritis, gout and venereal disease. This semisolid oil is a sweetly smoky, earthy and mysterious base  note . It has a touch of rose  to the aroma, and years ago was used to adulterate Rose Otto.