This standard specifies the chemical determination method for the thickness of the gold cover layer of jewelry. This standard is applicable to the determination of the thickness of the gold coating of jewelry (except when the base is gold) in the range of 0.0 1 to 0.5 μm.
QB/T 1133-1991 history
2017QB/T 1133-2017 Spectroscopic method for determination of gold coating thickness in jewelry
1991QB/T 1133-1991 Method for determination of thickness of gold coating on jewelry by chemical method