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• बराबर कटी हुई शुद्ध एवं सुखी हुई आम की लकड़ी
• The main ingredient in havan is mango wood which when burnt releases FORMIC ALDEHYDE a gas which kills harmful bacteria thus purifying the atmosphere
• The jaggery burnt in the havan also releases the formic aldehyde gas. A scientist TAUTLIK found that if we stay in a place where havan is being performed for ½ an hour the germs of typhoid fever are killed.