 In 1076 the Song prohibited the populaces of Hedong (Shanxi) and Hebei from selling sulphur and saltpetre to foreigners.In 1132 gunpowder was referred to specifically for its military values for the first time and was called "fire bomb medicine" rather than "fire medicine".While Chinese gunpowder formulas by the late 12th century and at least 1230 were powerful enough for explosive detonations and bursting cast iron shells, gunpowder was made more potent by applying the enrichment of sulphur from pyrite extracts.