Matale clove (Syzygium aromaticum) sun-drying: eugenol retention and headless stem grading?
How do artisanal spice growers in Central Province cure hand-plucked green clove buds on elevated mats to reach export moisture levels without shedding bud heads?
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6 Answers from travellers
Curing export-quality cloves in Matale requires plucking the clusters when the base of the green bud turns pinkish-red, just before the white petals open. Workers hand-separate buds from stalks on the day of harvest. The buds are spread in single layers on clean woven coir or plastic mesh mats elevated 1 meter above the ground to promote top and bottom air circulation. Drying takes 4 to 6 days under bright tropical morning sun. Buds must be turned gently by hand twice daily; rough raking knocks off the delicate round calyx head (the "crown"), reducing the crop to cheaper "headless" grade.
The target moisture endpoint is 11% to 12%; when bent between fingers, a cured dark reddish-brown clove stem should snap cleanly without feeling rubbery.
High-grade Ceylon cloves boast an essential oil content of 18% to 21% (dominated by eugenol and eugenyl acetate), giving them a heavier, sweeter oil density.
Cover drying mats immediately if afternoon cloudbursts approach; re-wetting partially dried cloves ferments essential oils and turns stems dull charcoal black.
Separated clove stems are dried separately and steam-distilled to produce industrial clove stem oil used in dental eugenol antiseptics.
Store cured cloves in double-layered jute sacks lined with food-grade polyethylene inside cool, dry rooms away from aromatic cinnamon and rubber storage.
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