A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c12.t3.16

v1.c12.t3.16

A second variety of it called phatakī or phullikā is slightly yellow . . . Another variety known as phulla tuvarī is white and acid in taste; iron changes to copper by the process of lepa [cf. Bk. VIII, 80, where the term “लेप:” is used in the sense of transmutation of the baser metals. The author seems to convey the idea that alum plays an important part in this process.] 60-62