Iron in Ancient India c7.s5.t1.23

c7.s5.t1.23

(3) While some are reported to prepare their "lauhas" by repeatedly heating powdered ferrous sulphate (क्षीरकास). Of course the method given in Chakrapāni, Rasendra-shār-samgraha and other works is followed by many orthodox physicians. In the methods Nos. (1) and (2) the rusts obtained are purified in the usual way, and then formed into balls with cow's urine or a decoction of the "three myrobalans," dried in the sun and calcined in the pit by means of burning cow-dung cakes in the usual way. The balling, powdering and calcining in an enclosed space are repeated ten, hundred or thousand times.