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Mentha oil futures for April fell by Rs 8.20, or 0.82%, to Rs 986 per kg in 539 lots.
At the Multi Commodity Exchange (MCX), the May contract lost Rs 3.20, or 0.33%, to Rs 959.90 per kg in 124 lots.
Prices fell as speculators off-loaded their positions amid weak demand against increased arrivals in the spot market.
