This standard specifies an accelerated test, using mercury(I) nitrate, for the purpose of detecting the presence of residual (internal) stresses in wrought copper and copper alloy products that might bring about failure of the material in service or storage through stress corrosion cracking.
DS/EN ISO 196:1995 history
1995DS/EN ISO 196:1995 Wrought copper and copper alloys - Detection of residual stress - Mercury(I) nitrate test