Sultry heat and humid winds — the perfect conditions to make salt .But in Tamil Nadu, salt producers are facing an uncertain season. In Thoothukudi, salt has long been a way of life. The district produces an overage of 25 lakh tonnes of salt, with vast salt pans spread across Vembar, Muthaiahpuram, Mullakadu, Pazhayakayal and Arumauganeri