The note of Silphium, a ghost from antiquity, is a profound and challenging olfactory experience, a reconstruction of a lost botanical treasure. It presents as intensely pungent and sharp upon initial encounter, often described with facets reminiscent of garlic, onion, and a distinct sulfurous edge, yet this initial shock quickly gives way to a surprising, almost sweet, resinous warmth. There's an underlying herbaceousness, akin to celery seed or lovage, and a subtle, savory umami quality that adds to its complexity. Its texture is perceived as dense and oily, almost sticky, reflecting its historical use as a resin. As a fragrance component, it possesses formidable intensity and projection, demanding attention. It behaves primarily as a heart or base note, evolving slowly from its initial piercing sharpness into a more grounded, earthy, and subtly sweet resinous accord, offering exceptional longevity and depth to a composition.