Minerals and Metals in Ancient India v1.c12.s6.5

v1.c12.s6.5

From the above table it will be seen that nickel is generally below .5 per cent and seldom exceeds 1 per cent, but the proportion of arsenic is relatively higher and sometimes excessive. The Sumerian copper also contains similar proportions of nickel, but it can be distinguished from the Indus Valley metal by its virtual freedom from arsenic. Arsenic-rich materials might have been deliberately added in Harappa copper.