Should I purify/refine 925 silver for silver nitrate?

[Mustafa Umut Sarac]

Buy an chemical mask if you dont want to kill yourself. You can import an mask as least. Which mask protects from fumes of this process ?

[Uncle Goose]

The best thing is just to do it outside, let the reaction begin and then take enough distance. You could wear a gasmask but why should you? Once the reaction is running there is nothing you can or should do, there is no reason to be in the vicinity of the fumes.