The note presents as an incredibly bright, intensely zesty, and profoundly tart citrus, immediately striking the senses with an effervescent green sharpness. It has a distinctive verdant quality that sets it apart from common lemons or limes, leaning more towards a very unripe, peppery mandarin or an exceptionally vibrant yuzu. There's an underlying complexity, a subtle herbal-floral whisper beneath the initial citrus burst, almost like a ghost of white tea or a hint of green tea leaf, preventing it from being purely acidic. Its texture is crisp and invigorating, almost palate-cleansing. Projection is typically strong and immediate, a radiant, almost sparkling top note that swiftly lifts and enlivens a composition. Its longevity as a pure top note is moderate, but its specific character can linger in the heart, lending a sustained crispness and 'lift'. It's characterized by its clean, bracing, almost metallic edge, devoid of any significant sweetness or juiciness one might find in a ripe orange.