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Mentha oil futures for April fell by Rs 31.10, or 3%, to Rs 1,006.50 per kg in 902 lots.
At the Multi Commodity Exchange (MCX), the May contract lost Rs 17.80, or 1.74%, to Rs 1,005 per kg in 154 lots.
Prices fell due to increased arrivals in the physical market.
Sentiment weakened further as investors indulged in profit-booking amid fall in spot market demand.
