The note of Pith presents itself with a distinctive dry, slightly powdery astringency that immediately cuts through the usual juicy sweetness of citrus. It possesses a subtle bitterness, akin to the white, fibrous membrane just beneath the zest of an orange or grapefruit. There's an underlying green, almost herbaceous nuance, hinting at the plant's structural integrity. Its texture is almost palpable: dry, chalky, and slightly rough, providing a fascinating counterpoint to the more volatile, effervescent top notes it often accompanies. Intensity is moderate, rarely overpowering but always present, anchoring the brighter notes. It projects softly, often perceived as an internal component of a larger citrus accord rather than a standalone feature. Longevity is fair, lingering gently into the heart of a composition, offering a sophisticated, unsweetened backbone. It acts primarily as a transition note, bridging sparkling top notes with a more grounded, natural heart.