The Black cardamom is Large cardamom, Amomum subulatum; The colour of matured fresh large cardamom is pink and this colour can be retained as such (pink) if the fresh cardamom is cured by flue pipe curing system; but the local farmers cure it by smoking in Bhatti curing system and the pink colour of fresh capsule turns to black and hence black cardamom (kala vala in Hindi) Ref.Varadarasan,S and BiswasA.K.(2002)Large cardamom (Amomum subulatum Roxb.) IN: Cardamom the genus Elettaria(eds.).Taylor & Francis, London pp.299-329
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