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Which plant part is the concrete extracted from?

From the fresh, just-opened osmanthus flower (the blossom) — not leaf, stem or root. Top's COA states "raw material: fresh O. fragrans var. thunbergii flower".

Because osmanthus flowers are tiny and low-yield, only the bloom is harvested at peak fragrance (autumn, Guilin), salted/color-protected, then solvent-extracted. The concrete carries the full floral wax + aroma complex (it is the "concrete", not the de-waxed "absolute"), so it is a paste/wax-like material — exactly why it is classed as a concrete rather than a fluid essential oil.

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Guilin Four Seasons Sunshine

Founded in 2006, Guilin Four Seasons Sunshine F&F Co., Ltd. is a natural plant extract manufacturer and OEM/ODM partner in Guilin, China, combining proprietary Living-Fragrance physical extraction with supercritical fluid extraction to deliver pure, traceable botanical ingredients to global food, flavor, fragrance and personal care brands. test