Outstanding debts were also agreed and the company permitted to export 250 tons of <answer>saltpetre</answer>. Again in 1673, Banks successfully negotiated another contract for 700 tons of <answer>saltpetre</answer> at £37,000 between the king and the company. So urgent was the need to supply the armed forces in the United Kingdom, America and elsewhere that the authorities sometimes turned a blind eye on the untaxed sales. One governor of the company was even reported as saying in 1864 that he would rather have the <answer>saltpetre</answer> made than the tax on salt.
Due to agreed debt what 250 tons  product was first permitted to be exported by the company after the seven years' war?
saltpetre