[Jewelry making - Article 00087] - Re: [Orchid] Annealing Silver

[Ian W. Wright]

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>     I ask this because I have performed an anneal at 600oC for about 3
>     minutes in a nitrogen environment, and when I allowed my specimen
>     to cool, the pure silver was cloudy and not at all lustrous as it
>     was before the anneal. 

    It sounds as though you have cooked up a layer of Silver Nitrate..
    In all probability, oxygen either from an oxide layer already on the
    metal or residual in the atmosphere has combined with the nitrogen to
    form silver nitrate which is white but darkens in the presence of
    light. Annealing is best done in air but with a thin layer of flux
    melted onto the metal. This completely excludes the effects of any
    atmospheric gases and also removes by chemical means any oxides. 

Best Wishes,

Ian
Ian W. Wright
Sheffield  UK


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