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dnp(½ð±Ò+0,VIP+0):thanks ^_^
dnp(½ð±Ò+1,VIP+0):½ð±Ò²¹ÉÏ¡­¡­^_^
Nitric  is  alsoan oxidant but not enough to oxidize  cr 3 to cr6 .
The color from your etching solution must be Fe 2 (green)--> Fe 3 (brown).
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