Reminiscence Oud Perfume by Reminiscence, Agarwood is one of the most sought-after perfume notes in the world. Also called oud, itâÇÖs been the center of many arabic fragrances for at least 3,000 years. One of the most expensive ingredients used by perfumers, it presents a changing face depending on the addition of other notes as well as the mood of the person experiencing it.