Tarragon (Estragon) Essential Oil CAS 8016-88-4

Estragon Oil is a colorless or very pale yellow to greenish-yellow liquid with a sweet-anisic, green-spicy, slightly celery-like odor, very similar to that of the fresh herb. Like anise and basil oils, estragon oil tends to resinify on ageing; it becomes dark yellow and sticky, viscous, and loses its fresh green note and pleasant aroma. The flavor of the oil is sweet and slightly spicy-aromatic, reminiscent of anise and basil with a faint celery-note.
Arctander, Steffen . Perfume and Flavor Materials of Natural Origin (p. 264)