Copper in Ancient India c5.7

c5.7

Regarding the compounds of copper the sulphide and the sulphate were prepared artificially. The sulphate or blue vitriol as well as green vitriol were known from the 3rd century B.C., thus showing that the difference between the two vitriols was known in India at a time when it was not suspected in Europe. Copper sulphate was prepared by the direct action of sulphuric acid on copper in the 16th century, the reaction being rediscovered in Europe by Glauber in 1648. The sulphide was very likely discoverd by Vrinda (900 A.D.) but certainly by Chakrapāni (1060 A.D.) by the combination of copper and sulphur.