As the US-Israel war in Iran drags into its third month, sulphuric acid – a chemical ingredient critical for fertiliser production and metal processing that has seldom grabbed global headlines – has become a keenly watched commodity.The military conflict in the Gulf and the effective blockage of the Strait of Hormuz initially triggered a squeeze on sulphuric acid, with prices on the rise after shipments in the region – which accounts for a quarter of global production – were largely stalled...