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Method 1:
3:1 (v/v) H2SO4/H2O2 at 90¡æ for 15 min
4.4 M HF and 0.02 M AgNO3 at 50 ¡ãC for 30 min
immersed in concentrated HNO3 for 15 min

Method 2:
8 M HF and 0.04 M AgNO3 at 50 ¡ãC for 30 min
1:2 (v/v) HNO3/H2O for 30 min
5~10% HF for 10~15min

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