... 01.03.00.3SH/T 1499.5-1997Nitric acid,mg/kg ≤10.010.050.01.1SH/T 1499.7-1997Oxidable matter,mg/kg ... ≤6070---17SH/T 1499.8-1997Chroma of melts,Pt-Co ... 01.03.00.3SH/T 1499.5-1997Nitric acid,mg/kg ≤10.010.050.01.1SH/T 1499.7-1997Oxidable matter,mg/ ... kg ≤6070---17SH/T 1499.8-1997Chroma of melts,Pt-Co ...